C primer plus 6 编程练习答案
环境：vs2017
1 /**编程练习2**/
2 /*1*/
3 #include<stdio.h>
4 int main(void)
5 {
6 printf("张三\n");
7 printf("张\n三\n");
8 printf("张");
9 printf("三\n");
10 getchar();
11 return 0;
12 }
13 /*2*/
14 #include<stdio.h>
15 int main(void)
16 {
17 printf("姓名：张三\n地址：中国\n");
18 getchar();
19 return 0;
20 }
21 /*3*/
22 #include<stdio.h>
23 int main(void)
24 {
25 int age = 0, days = 0;
26 printf("请输入您的年龄：");
27 scanf_s("%d", &age);
28 days = age * 365;
29 printf("您的年龄为：%d\n您的年龄转换成天数为：%d\n", age, days);
30 getchar();
31 getchar();
32 return 0;
33 }
34 /*4*/
35 #include<stdio.h>
36 void jolly(void);
37 void deny(void);
38 int main(void)
39 {
40 jolly();
41 jolly();
42 jolly();
43 deny();
44 getchar();
45 return 0;
46 }
47 void jolly(void)
48 {
49 printf("For he's a jolly good fellow!\n");
50 }
51 void deny(void)
52 {
53 printf("Which nobagy can deny!\n");
54 }
55 /*5*/
56 #include<stdio.h>
57 void br(void);
58 void ic(void);
59 int main(void)
60 {
61 br();
62 ic();
63 printf("India,China,\n");
64 printf("Brazil,Russia\n");
65 getchar();
66 return 0;
67 }
68 void br(void)
69 {
70 printf("Brazil,Russia,");
71 }
72 void ic(void)
73 {
74 printf("India,China\n");
75 }
76 /*6*/
77 #include<stdio.h>
78 int main(void)
79 {
80 int toes = 10;
81 printf("toes为：%d\ntoes的2倍为：%d\ntoes的平方为：%d\n", toes, 2 * toes, toes*toes);
82 getchar();
83 return 0;
84 }
85 /*7*/
86 #include<stdio.h>
87 void smile(void);
88 int main(void)
89 {
90 smile();
91 smile();
92 smile();
93 printf("\n");
94 smile();
95 smile();
96 printf("\n");
97 smile();
98 printf("\n");
99 getchar();
100 return 0;
101 }
102 void smile(void)
103 {
104 printf("Smile!");
105 }
106 /*8*/
107 #include<stdio.h>
108 void one_three(void);
109 void two(void);
110 int main(void)
111 {
112 printf("starting now:\n");
113 one_three();
114 printf("done!\n");
115 getchar();
116 return 0;
117 }
118 void one_three(void)
119 {
120 printf("one\n");
121 two();
122 printf("three\n");
123 }
124 void two(void)
125 {
126 printf("two\n");
127 }
1 /**编程练习3**/
2 /*1*/
3 #include<stdio.h>
4 int main(void)
5 {
6 int a;
7 float b,c;
8 a = 10000000000;//整数上溢
9 b = 3.4E38 + 10.0f;//浮点数上溢
10 c = 0.1234E-10 / 10;//浮点数下溢
11 printf("%d\n%f\n%f\n",a, b, c);
12 getchar();
13 return 0;
14 }
15 /*2*/
16 #include<stdio.h>
17 int main(void)
18 {
19 int a = 0;
20 printf("请输入一个0-127中的一个整数：");
21 scanf_s("%d", &a);
22 printf("该数对应的ASCLL码为：%c\n", a);
23 getchar();
24 getchar();
25 return 0;
26 }
27 /*3*/
28 #include<stdio.h>
29 int main(void)
30 {
31 printf("\a");//警报
32 printf("Startled by the sudden sound,Sally shouted,\n");
33 printf("\"By the Grate Pumpkin,what was that!\"");
34 getchar();
35 return 0;
36 }
37 /*4*/
38 #include<stdio.h>
39 int main(void)
40 {
41 float a;
42 printf("输入一个小数：");
43 scanf_s("%f", &a);
44 printf("%f\n%e\n%.2a\n", a, a, a);
45 getchar();
46 getchar();
47 return 0;
48 }
49 /*5*/
50 #include<stdio.h>
51 int main(void)
52 {
53 int age = 0;
54 long min = 0;
55 printf("请输入您的年龄：");
56 scanf_s("%ld", &age);
57 min = age * 3.156E7;
58 printf("转换为秒为：%ld秒\n", min);
59 getchar();
60 getchar();
61 return 0;
62 }
63 /*6*/
64 #include<stdio.h>
65 int main(void)
66 {
67 double a,c;
68 int b;
69 printf("请输入水的夸脱数：");
70 scanf_s("%d", &b);
71 a = 950 * 3.0E-23;
72 c = a * b;
73 printf("水分子数量为：%e\n", c);
74 getchar();
75 getchar();
76 return 0;
77 }
78 /*7*/
79 #include<stdio.h>
80 int main()
81 {
82 float tall_m, tall_cm;
83 printf("请输入您的身高：");
84 scanf_s("%f", &tall_m);
85 tall_cm = 2.54*tall_m;
86 printf("%.2f英寸转化为厘米为：%f厘米",tall_m, tall_cm);
87 getchar();
88 getchar();
89 return 0;
90 }
91 /*8*/
92 #include<stdio.h>
93 int main()
94 {
95 float cup,p,a,t,c;
96 printf("请输入杯数：");
97 scanf_s("%f", &cup);
98 p = cup/2;
99 a = 8 * cup;
100 t = 2 * a;
101 c = 3 * t;
102 printf("%f杯等于%f品脱，%f杯等于%f盎司，%f盎司等于%f大汤勺，%f大汤勺等于%f茶勺\n", cup, p, cup, a, a, t, t, c);
103 getchar();
104 getchar();
105 return 0;
106 }
1 /**编程练习4**/
2 /*1*/
3 #include<stdio.h>
4 int main(void)
5 {
6 char surname[40] ;
7 char name[40];
8 printf("请输入您的名：\n");
9 scanf_s("%s",name,40);////////////////////////////////注意！！！scanf_s()在输入数组时需要指明字段大小/////////////////////////////////////////
10 printf("请输入您的姓：\n");
11 scanf_s("%s",surname,40);
12 printf("您的名为：%s\n姓为：%s\n", name, surname);
13 getchar();
14 getchar();
15 //getchar();
16 return 0;
17 }
18 /*2*/
19 #include<stdio.h>
20 #include<string.h>
21 int main(void)
22 {
23 char name[40];
24 printf("请输入名字：\n");
25 scanf_s("%s", name, 40);
26 printf("\"%20s\"\n", name);
27 printf("\"%-20s\"\n", name);
28 printf("\"%*s\"\n", strlen(name) + 3, name);
29 getchar();
30 getchar();
31 return 0;
32 }
33 /*3*/
34 #include<stdio.h>
35 int main(void)
36 {
37 float a;
38 printf("输入一个小数：21.29\n");
39 scanf_s("%f", &a);
40 printf("输入的数是：%.1f或%.1e\n", a,a);
41 printf("输入的数是：%2.2f或%.3E\n", a, a);
42 getchar();
43 getchar();
44 return 0;
45 }
46 /*4*/
47 #include<stdio.h>
48 int main(void)
49 {
50 float heigh;
51 char name[40];
52 printf("请输入你的姓名：\n");
53 scanf_s("%s", name, 40);
54 printf("请输入你的身高（米）：\n");
55 scanf_s("%f", &heigh);
56 printf("%s,你有%.3f米高", name,heigh);
57 getchar();
58 getchar();
59 return 0;
60 }
61 /*5*/
62 #include<stdio.h>
63 int main(xoid)
64 {
65 float speed, size, time;
66 printf("请输入以兆位每秒（Mb/s）为单位的下载速度和以兆（MB）为单位的文件大小\n");
67 scanf_s("%f %f", &speed,&size);
68 time = 8 * size / speed;
69 printf("At %.2f megabits per second,a file of %.2f megabytes\n\
70 downloads in %.2f seconds.\n",speed,size,time);
71 getchar();
72 getchar();
73 return 0;
74 }
75 /*6*/
76 #include<stdio.h>
77 #include<string.h>
78 int main(void)
79 {
80 char surname[40];
81 char name[40];
82 int length1,length2;
83 printf("输入姓：\n");
84 scanf_s("%s", surname, 40);
85 printf("输入名：\n");
86 scanf_s("%s", name, 40);
87 length1 = strlen(surname);
88 length2 = strlen(name);
89 printf("%s %s\n", surname, name);
90 printf("%*d %*d\n", length1, length1,length2,length2);
91 printf("%s %s\n", surname, name);
92 printf("%-*d %-*d\n", length1, length1, length2, length2);
93 getchar();
94 getchar();
95 return 0;
96 }
97 /*7*/
98 #include<stdio.h>
99 #include<float.h>
100 int main(void)
101 {
102 double a=1.0 / 3.0;
103 float b=1.0 / 3.0;
104 printf("a=%.6f\tb=%.6f\n", a, b);
105 printf("a=%.12f\tb=%.12f\n", a, b);
106 printf("a=%.16f\tb=%.16f\n", a, b);
107 printf("float类型的最小有效数字为：%d\tdouble类型的最小有效数字为：%d\n", FLT_DIG, DBL_DIG);
108 getchar();
109 return 0;
110 }
111 /*8*/
112 #include<stdio.h>
113 #define GALLON 3.785 //1加仑等于3.785升
114 #define MILE 1.609 //1英里等于1.609千米
115 int main(void)
116 {
117 float gallon, mile;
118 printf("输入旅行里程：\n");
119 scanf_s("%f", &mile);
120 printf("输入消耗汽油量：\n");
121 scanf_s("%f", &gallon);
122 printf("油耗为：%.1f英里/加仑\n", mile / gallon);
123 printf("油耗转换为：%.1f升/100公里\n", gallon*GALLON / (mile*MILE) * 100);
124 getchar();
125 getchar();
126 return 0;
127 }
1 /****编程练习5****/
2 /*1*/
3 #include<stdio.h>
4 int main(void)
5 {
6 const int m_to_h = 60;
7 int m,h,left;
8 printf("输入一个时间（分钟）：\n");
9 scanf_s("%d", &m);
10 while (m>0)
11 {
12 h = m/m_to_h;
13 left=m%m_to_h;
14 printf("%d分钟转化为小时为：%d小时%d分钟\n", m, h,left);
15 scanf_s("%d", &m);
16 }
17 getchar();
18 //getchar();
19 return 0;
20 }
21 /*2*/
22 #include<stdio.h>
23 int main(void)
24 {
25 int a,b;
26 printf("请输入一个整数：\n");
27 scanf_s("%d", &a);
28 b = a + 10;
29 while (a<=b)
30 {
31 printf("打印比该数大10的整数为:%d\n", a);
32 a++;
33 }
34 getchar();
35 getchar();
36 return 0;
37 }
38 /*3*/
39 #include<stdio.h>
40 int main(void)
41 {
42 const int day_to_week = 7;
43 int days,week,left;
44 printf("请输入天数：\n");
45 scanf_s("%d", &days);
46 while (days>0)
47 {
48 week = days/day_to_week;
49 left = days%day_to_week;
50 printf("%d天转化为%d周%d天\n", days, week, left);
51 scanf_s("%d", &days);
52 }
53 getchar();
54 getchar();
55 return 0;
56 }
57 /*4*/
58 #include<stdio.h>
59 #define FEET_TO_CM 30.48
60 #define INCHE_TO_CM 2.54
61 int main(void)
62 {
63 float heigh,inches;//inches英寸
64 int foot;//英尺
65 printf("输入身高(cm)：\n");
66 scanf_s("%f", &heigh);
67 while (heigh>0)
68 {
69 foot = heigh / FEET_TO_CM;
70 inches = (heigh - foot * FEET_TO_CM) / INCHE_TO_CM;
71 printf("%.2fcm=%d英尺%.2f英寸", heigh, foot, inches);
72 scanf_s("%f", &heigh);
73 }
74 getchar();
75 //getchar();
76 return 0;
77 }
78 /*5*/
79 #include<stdio.h>
80 int main(void)
81 {
82 int sum=0, count=0,day=0;
83 printf("输入天数：\n");
84 scanf_s("%d", &day);
85 while (count++<day)
86 {
87 sum = sum + count;
88 }
89 printf("%d天挣了%d元钱\n", day, sum);
90 getchar();
91 getchar();
92 return 0;
93 }
94 /*6*/
95 #include<stdio.h>
96 int main(void)
97 {
98 int sum = 0, count = 0, day = 0;
99 printf("输入天数：\n");
100 scanf_s("%d", &day);
101 while (count++ < day)
102 {
103 sum = sum + count*count;
104 }
105 printf("%d天挣了%d元钱\n", day, sum);
106 getchar();
107 getchar();
108 return 0;
109 }
110 /*7*/
111 #include<stdio.h>
112 void value3(double a);
113 int main(void)
114 {
115 double a;
116 printf("输入一个小数：\n");
117 scanf_s("%lf", &a);
118 value3(a);
119 getchar();
120 getchar();
121 return 0;
122 }
123 void value3(double a)
124 {
125 double b;
126 b = a * a*a;
127 printf("%lf立方为：%lf\n", a, b);
128 }
129 /*8*/
130 #include<stdio.h>
131 int main(void)
132 {
133 int a, b;
134 printf("\t*****求模运算*****\t\n");
135 printf("输入一个数作为第2个运算对象：\n");
136 scanf_s("%d", &a);
137 printf("输入第二个数作为第1个运算对象：\n");
138 scanf_s("%d", &b);
139 printf("求模运算%d%%%d=%d\n", b, a, b%a);
140 printf("输入下一个数作为第1个运算对象：\n");
141 scanf_s("%d", &b);
142 while (b>0)
143 {
144 printf("求模运算%d%%%d=%d\n", b, a, b%a);
145 printf("输入下一个数作为第1个运算对象：\n");
146 scanf_s("%d", &b);
147 }
148 printf("结束\n");
149 getchar();
150 getchar();
151 return 0;
152 }
153 /*9*/
154 #include<stdio.h>
155 void Temperatures(double h_tem);
156 int main(void)
157 {
158 double h_tem;//华氏度
159 printf("请输入华氏温度(输入非数字以退出)：\n");
160 while (scanf_s("%lf", &h_tem)==1)
161 {
162 Temperatures(h_tem);
163 printf("请输入华氏温度(输入非数字以退出)：\n");
164 }
165 printf("程序退出\n");
166 getchar();
167 getchar();
168 return 0;
169 }
170 void Temperatures(double h_tem)
171 {
172 double s_tem;//摄氏度
173 double k_tem;//开氏度
174 const double h_to_s = 32.0;//华氏度转摄氏度要用到的常量值
175 const double s_to_k = 273.16;//摄氏度转开氏度要用到的常量值
176 s_tem = 5.0 / 9.0 * (h_tem - h_to_s);
177 k_tem = s_tem + s_to_k;
178 printf("%.2lf华氏度等于%.2lf摄氏度和%.2lf开氏度\n", h_tem, s_tem, k_tem);
179 }
1 /****编程练习6****/
2 /*1*/
3 #include<stdio.h>
4 #define size 26
5 int main(void)
6 {
7 char ch[size];
8 int a;
9 for (a = 0; a<size; a++)
10 ch[a] = 'a' + a;
11 for (a = 0;a < size;a++)
12 printf("%c", ch[a]);
13 getchar();
14 return 0;
15 }
16 /*2*/
17 #include<stdio.h>
18 int main(void)
19 {
20 int row, clo;
21 char ch = '$';
22 for (row=0; row< 5; row++)
23 {
24 for (clo = 0; clo < row + 1; clo++)
25 printf("%c",ch);
26 printf("\n");
27 }
28 getchar();
29 return 0;
30 }
31 /*3*/
32 #include<stdio.h>
33 int main(void)
34 {
35 char ch = 'F';
36 char start, end;
37 for (end=ch;end>='A'; end--)
38 {
39 for (start=ch;start>=end;start--)
40 printf("%c", start);
41 printf("\n");
42 }
43 getchar();
44 return 0;
45 }
46 /*4*/
47 #include<stdio.h>
48 int main(void)
49 {
50 const char end = 'U';
51 char start;
52 int row, clo;
53 for (row=0,start = 'A'; start<=end;row++ )
54 {
55 for (clo = 0;clo <= row;clo++)
56 {
57 printf("%c", start);
58 start++;
59 }
60 printf("\n");
61 }
62 getchar();
63 return 0;
64 }
65 /*5*/
66 #include<stdio.h>
67 int main(void)
68 {
69 char start = 'A';
70 char end;
71 char ch = start;
72 int row, clo;
73 printf("输入一个大写字母：\n");
74 scanf_s("%c", &end);
75 printf(" 字母金字塔\n");
76 for ( row=0; row <= end-start; row++,ch = start)
77 {
78 for (clo = 0;clo < end - start - row;clo++)
79 printf(" ");
80 for (int k = 0;k <= row;k++)
81 {
82 printf("%c", ch);
83 ch++;
84 }
85 ch -= 2;
86 for (int c = 0;c < row;c++)
87 {
88 printf("%c", ch);
89 ch--;
90 }
91 printf("\n");
92 }
93 getchar();
94 getchar();
95 return 0;
96 }
97 /*6*/
98 #include <stdio.h>
99 int main( void )
100 {
101 int start, end;
102 printf("输入开始的数字：\n");
103 scanf_s("%d", &start);
104 printf("输入结束数字：\n");
105 scanf_s("%d", &end);
106 printf("原数\t平方\t立方\n");
107 for (start;start <= end;start++)
108 {
109 printf("%d\t%d\t%d\n", start, start*start, start*start*start);
110 }
111 getchar();
112 getchar();
113 return 0;
114 }
115 /*7*/
116 #include<stdio.h>
117 #include<string.h>
118 #define SIZE 40
119 int main(void)
120 {
121 char word[SIZE];
122 int i;
123 printf("请输入一个单词：\n");
124 scanf_s("%s", word, 40);
125 printf("该单词有%d个字母，单词是%s\n", strlen(word), word);
126 printf("倒序为：");
127 for (i = strlen(word - 1);i >= 0;i--)//strlen(word - 1)跳过字符串后面的空格
128 printf("%c", word[i]);
129 printf("\n");
130 getchar();
131 getchar();
132 return 0;
133 }
134 /*8*/
135 #include<stdio.h>
136 int main(void)
137 {
138 double a, b;
139 int status;//输入状态
140 printf("输入2个浮点数（输入q退出）：\n");
141 while (scanf_s("%lf%lf", &a, &b) == 2)//验证是否输入了2个值
142 {
143 printf("结果是%.3lf", (a - b) / (a*b));
144 printf("继续输入2个浮点数（输入q退出）：\n");
145 }
146 getchar();
147 return 0;
148 }
149 /*9*/
150 #include<stdio.h>
151 float result(float a, float b);
152 int main(void)
153 {
154 double a, b;
155 int status;//输入状态
156 printf("输入2个浮点数（输入q退出）：\n");
157 while (scanf_s("%lf%lf", &a, &b) == 2)//验证是否输入了2个值
158 {
159 printf("结果是%.3lf", result(a,b));
160 printf("继续输入2个浮点数（输入q退出）：\n");
161 }
162 getchar();
163 return 0;
164 }
165 float result(float a, float b)
166 {
167 float result;//result名称不唯一
168 result = (a - b) / (a*b);
169 return result;
170 }
171 /*10*/
172 #include<stdio.h>
173 int main(void)
174 {
175 int up, down;//上限和下限
176 printf("输入上限整数和下限整数：\n");
177 scanf_s("%d %d", &up, &down);
178 while (up>down)
179 {
180 int sum = 0;//初始化平方和sum
181 for (int i = sum;i <= up;i++)
182 sum = sum + i * i;
183 printf("平方和从%d到%d是%d\n", up*up, down*down, sum);
184 printf("继续输入上限整数和下限整数：\n");
185 scanf_s("%d %d", &up, &down);
186 }
187 printf("结束！\n");
188 getchar();
189 getchar();
190 return 0;
191 }
192 /*11*/
193 #include<stdio.h>
194 #define SIZE 8
195 int main(void)
196 {
197 int a[SIZE];
198 int i;
199 for ( i = 0; i < SIZE; i++)
200 scanf_s("%d", &a[i]);
201 for (i = SIZE - 1;i >= 0;i--)
202 printf("%d", a[i]);
203 getchar();
204 getchar();
205 return 0;
206 }
207 /*12*/
208 #include<stdio.h>
209 int main(void)
210 {
211 int times;
212 float count1 = 1.0f;//分母
213 float count2 = 1.0f;//分母
214 float sum1 = 0.0;
215 float sum2 = 0.0;
216 printf("输入计算次数(输入0或负数退出):\n");
217 scanf_s("%d", ×);
218 for (int i = 1;i <= times;i++, count1++)
219 sum1 = sum1 + 1.0 / count1;
220 for (int j = 1;j <= times;j++, count2++)
221 {
222 if (j%2==0)
223 {
224 sum2 = sum2 - 1.0 / count2;
225 }
226 else
227 {
228 sum2 = sum2 + 1.0 / count2;
229 }
230 }
231 printf("第一个公式的计算结果为：%f\n", sum1);
232 printf("第二个公式的计算结果为：%f\n", sum2);
233 getchar();
234 getchar();
235 return 0;
236 }
237 /*13*/
238 #include<stdio.h>
239 #define SIZE 8
240 int main(void)
241 {
242 int arry[SIZE];
243 int i, n;
244 for (i = 0, n = 2;i < SIZE;i++, n *= 2)
245 arry[i] = n;
246 i = 0;
247 do
248 {
249 printf("%d\n", arry[i]);
250 i++;
251 } while (i<SIZE);
252 getchar();
253 return 0;
254 }
255 /*14*/
256 #include<stdio.h>
257 #define SIZE 8
258 int main(void)
259 {
260 double arry1[SIZE];
261 double arry2[SIZE];
262 int i;
263
264 printf("输入值：\n");
265 for (i = 0;i < SIZE;i++)
266 scanf_s("%lf", &arry1[i]);//读入第一个数组
267 arry2[0] = arry1[0];//初始化第二个数组
268 for (i = 1;i < SIZE;i++)
269 arry2[i] = arry2[i - 1] + arry1[i];//计算第二个元组各数之和
270 for (i = 0;i < SIZE;i++)
271 printf("%8.2lf", arry1[i]);
272 printf("\n");
273 for (i = 0;i < SIZE;i++)
274 printf("%8.2lf", arry2[i]);
275
276 getchar();
277 getchar();
278 return 0;
279 }
280 /*15*/
281 #include<stdio.h>
282 #define SIZE 255
283 int main(void)
284 {
285 char arry[SIZE];
286 int i = -1;
287 printf("输入一个单词：\n");
288 do
289 {
290 i++;//由arry[0]开始循环读入
291 scanf_s("%c", &arry[i]);
292 } while (arry[i]!='\n');
293 for (;i >= 0;i--)
294 printf("%c", arry[i]);
295 getchar();
296 return 0;
297 }
298 /*16*/
299 #include<stdio.h>
300 #define Daphne_RATE 0.10 //Daphne利率
301 #define Deiedre_RATE 0.05 //Deiedre利率
302 #define MONEY 100.0 //投资100元
303 int main(void)
304 {
305 int year=0;
306 double Daphne_money=MONEY; //Daphne的投资额
307 double Deiedre_money=MONEY; //Deiedre的投资额
308 while (Deiedre_money <= Daphne_money) //当Deiedre投资额超过Daphne的投资额退出循环
309 {
310 year++;
311 Daphne_money = Daphne_money + MONEY * Daphne_RATE;
312 Deiedre_money = Deiedre_money + Deiedre_money * Deiedre_RATE;
313 }
314 printf("用了%d年Deiedre的投资额超过Daphne的投资额\n", year);
315 printf("Daphne的投资额为：%f\tDeiedre的投资额为%f\n", Daphne_money, Deiedre_money);
316 getchar();
317 return 0;
318 }
319 /*17*/
320 #include<stdio.h>
321 #define RATE 0.08
322 int main(void)
323 {
324 double money = 100;
325 int year = 0;
326 while (money>0)
327 {
328 year++;
329 money = money + money * RATE;
330 money = money - 10;
331 }
332 printf("%d年后Chuckie会取完账户里的钱\n", year);
333 getchar();
334 return 0;
335 }
336 /*18*/
337 #include<stdio.h>
338 #define DB_NUMBER 150 //邓巴数
339 int main(void)
340 {
341 int weeks = 1;
342 int friends = 5;
343 while (friends<DB_NUMBER)
344 {
345 friends = (friends - weeks) * 2;
346 printf("%d周后，Rabnud博士有%d个朋友\n", weeks, friends);
347 weeks++;
348 }
349 getchar();
350 return 0;
351 }
1 /*****编程练习7*****/
2 /*1*/
3 #include<stdio.h>
4 int main(void)
5 {
6 char ch;
7 int spa_count=0, lin_count=0, oth_count=0; //空格数，换行符数，其他字符数
8 printf("输入字符进行统计（输入字符‘#’退出程序）：\n");
9 while ((ch=getchar())!='#')
10 {
11 if (ch == ' ')
12 spa_count++;
13 else if (ch == '\n')
14 lin_count++;
15 else
16 oth_count++;
17 }
18 printf("你输入的字符中空格数有%d个，换行符有%d个，其他字符数有%d个\n", spa_count, lin_count, oth_count);
19 getchar();
20 getchar();
21 return 0;
22 }
23 /*2*/
24 #include<stdio.h>
25 int main(void)
26 {
27 char ch;
28 const int line = 8;
29 int chsum = 0;//统计字符数
30 printf("输入字符进行统计（输入‘#’字符结束）：\n");
31 while ((ch=getchar())!='#')
32 {
33 printf("%c:%d\t", ch, ch);
34 chsum++;
35 if (chsum%line == 0)
36 printf("\n");
37 }
38 printf("\n");
39 getchar();
40 getchar();
41 return 0;
42 }
43 /*3*/
44 #include<stdio.h>
45 int main(void)
46 {
47 int a;
48 int ou_count = 0;//偶数个数
49 int ji_count = 0;//奇数个数
50 int ou_sum = 0;//偶数的和
51 int ji_sum = 0;//奇数和
52 float ou_average;//偶数平均值
53 float ji_average;//奇数平均值
54 printf("输入整数进行计算（输入‘0’结束）：");
55 while (scanf_s("%d", &a) == 1 && a != 0)
56 {
57 if (a % 2 == 0)
58 {
59 ou_count++;
60 ou_sum += a;
61 }
62 else
63 {
64 ji_count++;
65 ji_sum += a;
66 }
67 }
68 printf("偶数个数：%d\n", ou_count);
69 if (ou_count>0)
70 {
71 ou_average = ou_sum / ou_count;
72 printf("偶数平均值为：%.2f\n", ou_average);
73 }
74 printf("奇数个数：%d\n", ji_count);
75 if (ji_count>0)
76 {
77 ji_average = ji_sum / ji_count;
78 printf("奇数平均值为：%.2f\n", ji_average);
79 }
80 printf("结束\n");
81 getchar();
82 getchar();
83 return 0;
84 }
85 /*4*/
86 #include<stdio.h>
87 int main(void)
88 {
89 char ch;
90 int count1=0;//替换句号的次数
91 int count2=0;//替换感叹号的次数
92 printf("输入字符进行统计(输入‘#’结束)：\n");
93 while ((ch=getchar())!='#')
94 {
95 if (ch == '.')
96 {
97 putchar('!');
98 count1++;
99 }
100 else if (ch == '!')
101 {
102 putchar('!');
103 putchar('!');
104 count2++;
105 }
106 else
107 putchar(ch);
108 }
109 printf("\n'!'替代'.'进行了%d次\n", count1);
110 printf("'!!'替代'！'进行了%d次\n", count2);
111 getchar();
112 getchar();
113 return 0;
114 }
115 /*5*/
116 #include<stdio.h>
117 int main(void)
118 {
119 char ch;
120 int count1 = 0;//替换句号的次数
121 int count2 = 0;//替换感叹号的次数
122 printf("输入字符进行统计(输入‘#’结束)：\n");
123 while ((ch = getchar()) != '#')
124 {
125 switch (ch)
126 {
127 case'.':
128 putchar('!');
129 count1++;
130 break;
131 case'!':
132 putchar('!');
133 putchar('!');
134 count2++;
135 break;
136 default:
137 putchar(ch);
138 }
139 }
140 printf("\n'!'替代'.'进行了%d次\n", count1);
141 printf("'!!'替代'！'进行了%d次\n", count2);
142 getchar();
143 getchar();
144 return 0;
145 }
146 /*6*/
147 #include<stdio.h>
148 int main(void)
149 {
150 char ch;
151 char fir, sec;//第一个接收到的字符和第二个字符
152 int count = 0;//ei出现的次数
153 printf("输入进行统计(输入‘#’结束)：\n");
154 while ((ch=getchar())!='#')
155 {
156 if (ch=='e')
157 {
158 fir = ch;
159 continue;
160 }
161 if (ch=='i')
162 {
163 sec = ch;
164
165 if (fir == 'e'&&sec == 'i')
166 count++; //判断前一个字符是‘e’，第二个是‘i’，则次数加1
167 //初始化fir和sec
168 fir = 'a';
169 sec = 'a';
170 continue;
171 }
172 continue;
173 }
174 printf("'ei'出现了%d次\n",count);
175 getchar();
176 getchar();
177 return 0;
178 }
179 /*7*/
180 #include<stdio.h>
181 #define BASE_MONEY 10.00//基本工资
182 #define BASE_TIME 40//基本加班时间
183 #define OVER_TIME 1.5//超过基本时间
184 #define MONY1 300//税率分界线1
185 #define MONY2 150//税率分界线2
186 #define RATE1 0.15//MONY1前的税率
187 #define RATE2 0.20//MONY2的税率
188 #define RATE3 0.25//剩下的税率
189 int main(void)
190 {
191 double hours;//一周工作时间
192 double sum;//工资总数
193 double rate_mony;//税金
194 double income;//净收入
195 printf("输入一周工作小时数：\n");
196 scanf_s("%lf", &hours);
197 if (hours <= BASE_TIME)
198 sum = hours * BASE_MONEY;
199 else
200 sum = BASE_TIME * BASE_MONEY + (hours - BASE_TIME)*BASE_MONEY*OVER_TIME;
201 if (sum <= MONY1)
202 rate_mony = sum * RATE1;
203 else if (sum <= MONY1 + MONY2)
204 rate_mony = MONY1 * RATE1 + (sum - MONY1)*RATE2;
205 else
206 rate_mony = MONY1 * RATE1 + MONY2 * RATE2 + (sum - MONY1 - MONY2)*RATE3;
207 income = sum - rate_mony;
208 printf("工资总额是：%.2lf\t税金是：%.2lf\t净收入是：%.2lf\n", sum, rate_mony, income);
209 getchar();
210 getchar();
211 return 0;
212 }
213 /*8*/
214 #include<stdio.h>
215 #define BASE_TIME 40 //基本加班时间
216 #define OVER_TIME 1.5 //超过基本时间
217 #define MONY1 300 //税率分界线1
218 #define MONY2 150 //税率分界线2
219 #define BASE_LEVEL1 8.75
220 #define BASE_LEVEL2 9.33
221 #define BASE_LEVEL3 10.00
222 #define BASE_LEVEL4 11.20
223 #define RATE1 0.15 //MONY1前的税率
224 #define RATE2 0.20 //MONY2的税率
225 #define RATE3 0.25 //剩下的税率
226 int main(void)
227 {
228 int choice;
229 double basy_money;
230 double hours; //一周工作时间
231 double sum; //工资总数
232 double rate_money; //税金
233 double income; //净收入
234 printf("*******************************************************\n");
235 printf("输入与薪资或操作对应的编号进行操作：\n");
236 printf("1) $8.75/hours \t2) $9.33/hours\n");
237 printf("3) $10.00/hours \t4) $11.20/hours\n");
238 printf("5) 退出\n");
239 printf("*******************************************************\n");
240 while (scanf_s("%d",&choice) == 1 && choice != 5)
241 {
242 switch (choice)
243 {
244 case 1:
245 basy_money = BASE_LEVEL1;
246 break;
247 case 2:
248 basy_money = BASE_LEVEL2;
249 break;
250 case 3:
251 basy_money = BASE_LEVEL3;
252 break;
253 case 4:
254 basy_money = BASE_LEVEL4;
255 break;
256 default:
257 printf("请输入1-4数字进行选择（输入数字5退出）。\n请输入正确的数字\n");
258 continue;
259 }
260 printf("输入一周工作小时数：\n");
261 scanf_s("%lf", &hours);
262 if (hours <= BASE_TIME)
263 sum = basy_money * hours;
264 else
265 sum = BASE_TIME * basy_money + (hours - BASE_TIME)*basy_money*OVER_TIME;
266 if (sum <= MONY1)
267 rate_money = sum * RATE1;
268 else if (sum <= (MONY1 + MONY2))
269 rate_money = MONY1 * RATE1 + (sum - MONY1) * RATE2;
270 else
271 rate_money = MONY1 * RATE1 + MONY2 * RATE2 + (sum - MONY1 - MONY2)*RATE3;
272 income = sum - rate_money;
273 printf("工资总额是：%.2lf\t税金是：%.2lf\t净收入是：%.2lf\n", sum, rate_money, income);
274 printf("输入下一个数字继续\n");
275 }
276 getchar();
277 return 0;
278 }
279 /*9*/
280 #include<stdio.h>
281 #include<stdbool.h>
282 int main(void)
283 {
284 int limit;//输入的数
285 int num;
286 int div;
287 bool numIsPrime; //判断是否为素数
288 printf("输入正整数：");
289 while (scanf_s("%d",&limit) == 1 && limit > 0)
290 {
291 if (limit > 1)
292 printf("以下为素数：\n", limit);
293 else
294 printf("没有素数\n");
295 for (num=2 ; num <= limit; num++)
296 {
297 for (div = 2, numIsPrime = true;(div*div) <= num;div++)
298 if (num%div == 0)
299 numIsPrime = false;
300 if (numIsPrime)
301 printf("%d是素数。\n", num);
302 }
303 printf("输入正整数(输入q退出)：");
304 }
305 printf("结束\n");
306 getchar();
307 return 0;
308 }
309 /*10*/
310 #include<stdio.h>
311 #define LEVEL1 17850
312 #define LEVEL2 23900
313 #define LEVEL3 29750
314 #define LEVEL4 14875
315 #define RATE1 0.15
316 #define RATE2 0.28
317 int main(void)
318 {
319 int choice; //选择号码
320 long level; //税金等级
321 double income; //收入
322 double taxmoney; //税金
323 printf("****************************************************************************\n");
324 printf("输入类别编号：\n");
325 printf("1) 单身 \t2) 户主 \t3) 已婚，共有 \t4) 已婚，离异\n");
326 printf("5) 退出\n");
327 printf("****************************************************************************\n");
328 while (scanf_s("%d",&choice) == 1 && choice != 5)
329 {
330 switch (choice)
331 {
332 case 1:
333 level = LEVEL1;
334 break;
335 case 2:
336 level = LEVEL2;
337 break;
338 case 3:
339 level = LEVEL3;
340 break;
341 case 4:
342 level = LEVEL4;
343 break;
344 default:
345 printf("请输入1-4数字进行选择（输入数字5退出）。\n请输入正确的数字\n");
346 break;
347 }
348 printf("请输入你的收入：");
349 scanf_s("%lf", &income);
350 if (income <= level)
351 taxmoney = income * RATE1;
352 else
353 taxmoney = level * RATE1 + (income - level)*RATE2;
354 printf("你的税金为%.2lf元\n", taxmoney);
355 printf("继续输入选择（输入5退出）：\n");
356 }
357 getchar();
358 return 0;
359 }
360 /*11*/
361 #include<stdio.h>
362 #define Y_PRICE 2.05 //洋蓟 单价
363 #define T_PRICE 1.15 //甜菜
364 #define H_PRICE 1.09 //胡萝卜
365 #define DISCOUNT 0.05 //折扣优惠
366
367 #define WEIGHT_LEVEL1 5 //重量层次
368 #define WEIGHT_LEVEL2 20
369
370 #define TRANS_LEVEL1 6.5 //运费和包装费层次
371 #define TRANS_LEVEL2 14
372
373 #define TRANS_LEVEL3 0.5 //额外增费
374 int main(void)
375 {
376 char ch; //选择字符
377 float input; //输入磅数
378 float y_weight = 0; //洋蓟磅数
379 float t_weight = 0; //甜菜磅数
380 float h_weight = 0; //胡萝卜磅数
381 float total_weight; //总重
382 float cost; //花费
383 float total_cost; //总花费：买菜+运费
384 float discount; //折扣
385 float tran_cost; //运费
386 float total_all;
387 printf("************************************************\n");
388 printf("输入编号进行选择：\n");
389 printf("a:洋蓟\tb:甜菜\tc:胡萝卜\nq:退出并打印账单\n");
390 printf("************************************************\n");
391 while ((ch = getchar()) != 'q')
392 {
393 if (ch == '\n')
394 continue;
395 while (getchar() != '\n')
396 continue;
397 switch (ch)
398 {
399 case 'a':
400 printf("输入洋蓟的磅数：");
401 scanf_s("%f", &input);
402 y_weight = y_weight + input;
403 break;
404 case 'b':
405 printf("输入甜菜的磅数：");
406 scanf_s("%f", &input);
407 t_weight = t_weight + input;
408 break;
409 case 'c':
410 printf("输入胡萝卜的磅数：");
411 scanf_s("%f", &input);
412 h_weight = h_weight + input;
413 break;
414 default:
415 printf("输入错误,请输入a,b,c选择蔬菜，q退出\n");
416 break;
417 }
418 printf("继续输入进行购物\n");
419 }
420 total_weight = y_weight + t_weight + h_weight;
421 cost = y_weight * Y_PRICE + t_weight * T_PRICE + h_weight * H_PRICE;
422 if (cost >= 100)
423 discount = cost * DISCOUNT;
424 else
425 discount = 0;
426 if (total_weight <= 0)
427 tran_cost = 0;
428 else if (total_weight <= WEIGHT_LEVEL1)
429 tran_cost = TRANS_LEVEL1;
430 else if (total_weight <= WEIGHT_LEVEL2)
431 tran_cost = TRANS_LEVEL2;
432 else
433 tran_cost = TRANS_LEVEL2 + TRANS_LEVEL3 * total_weight;
434 total_all = cost + tran_cost - discount;
435 printf("你的订单如下：\n");
436 printf("2.05美元/磅的洋蓟订购了%.2f磅\n", y_weight);
437 printf("1.15美元/磅的甜菜订购了%.2f磅\n", t_weight);
438 printf("1.09美元/磅的胡萝卜订购了%.2f磅\n", h_weight);
439 printf("买蔬菜的费用为：%.2f\n", cost);
440 if(cost>100)
441 printf("折扣为：%.2f\n", discount);
442 printf("运费和包装费为：%.2f\n", tran_cost);
443 printf("所有费用为：%.2f\n", total_all);
444 getchar();
445 getchar();
446 return 0;
447 }
1 /****编程练习8****/ 2 /*1*/ 3 #include<stdio.h> 4 int main(void) 5 { 6 char ch; 7 int a = 0; 8 while ((ch=getchar())!=EOF) 9 a++; 10 printf("读取到%d个字符。\n", a); 11 getchar(); 12 return 0; 13 } 14 /*2*/ 15 #include<stdio.h> 16 int main(void) 17 { 18 char ch; 19 int i=0; //统计每行的值 20 while ((ch=getchar())!=EOF) 21 { 22 if (ch == '\n') 23 { 24 putchar('\\'); 25 putchar('n'); 26 printf(" %d\n", ch); 27 i = 0; 28 } 29 else if (ch == '\t') 30 { 31 putchar('\\'); 32 putchar('t'); 33 printf("%d\n", ch); 34 } 35 else if (ch < ' ') 36 { 37 putchar('^'); 38 putchar(ch + 64); 39 printf("%d\t", ch); 40 } 41 else 42 printf("%c %d\t", ch, ch); 43 if (++i == 10) 44 { 45 printf("\n"); 46 i = 0; 47 } 48 } 49 getchar(); 50 return 0; 51 } 52 /*3*/ 53 #include<stdio.h> 54 #include<ctype.h> 55 int main(void) 56 { 57 int ch; 58 //统计个数，用不到负数 59 unsigned A_count = 0; //大写 60 unsigned a_count = 0; //小写 61 unsigned oth_count = 0; //其他字符个数 62 while ((ch=getchar())!=EOF) 63 { 64 //if (isupper(ch)) //用isupper()函数判断是否为大写 65 if(ch>='A'&&ch<='Z') //可以用该行替换上一行，这种方法不用再调用ctype.h 66 A_count++; 67 else if (islower(ch)) //用islower()函数判断是否为小写 68 a_count++; 69 else 70 oth_count++; 71 } 72 printf("输入中大写字母有%d个\n", A_count); 73 printf("小写字母有%d个\n", a_count); 74 printf("其他字符有%d个\n", oth_count); 75 getchar(); 76 return 0; 77 } 78 /*4*/ 79 #include<stdio.h> 80 #include<ctype.h> 81 #include<stdbool.h> 82 int main(void) 83 { 84 char ch; 85 int words = 0, count = 0; //单词 字母总数 86 bool inword = false; //判断是否是一个单词 87 float average; 88 while ((ch=getchar())!=EOF) 89 { 90 if (isalpha(ch)) 91 count++; //如果是个字符，字母+1 92 if (!isspace(ch) && !inword) 93 { 94 inword = true; 95 words++; //如果不是空格且inword为true，单词+1 96 } 97 if (isspace(ch) && inword) 98 inword = false; //如果是个空格，且inword为true，此时并不是个完整单词，需要初始化inword 99 if (ispunct(ch)) 100 continue; //如果是字符，中断本次循环 101 } 102 average = count / words; 103 printf("平均每个单词有%.2f个字母", average); 104 getchar(); 105 return 0; 106 } 107 /*5*/ 108 #include<stdio.h> 109 int main(void) 110 { 111 int high = 100; 112 int low = 1; 113 int guess=(low+high)/2; 114 char response; 115 printf("你在1-100中选一个数字，我能猜出那个数字！"); 116 printf("\n如果我回答正确，就输入'y'"); 117 printf("\n如果我猜的数太高，就输入'h'"); 118 printf("\n如果我猜的数太小，就输入'l'\n"); 119 printf("你选择的数字是 %d?\n", guess); 120 while ((response=getchar())!='y') 121 { 122 if (response == '\n') 123 continue; 124 if (response != 'h'&&response != 'l') 125 { 126 printf("对不起，输入错误！请重新输入！\n"); 127 continue; 128 } 129 if (response == 'h') 130 high = guess - 1; 131 else if (response == 'l') 132 low = guess + 1; 133 guess = (high + low) / 2; 134 printf("你选择的数字是 %d?\n", guess); 135 } 136 printf("哈哈！我猜对了！\n"); 137 getchar(); 138 getchar(); 139 return 0; 140 } 141 /*6*/ 142 #include<stdio.h> 143 #include<ctype.h> 144 char get_first(void); 145 int main(void) 146 { 147 char ch; 148 ch = get_first(); 149 putchar(ch); 150 getchar(); 151 return 0; 152 } 153 char get_first(void) 154 { 155 char ch; 156 ch = getchar(); 157 while (isspace(ch)) 158 ch = getchar(); 159 while (getchar() != '\n') 160 continue; 161 return ch; 162 } 163 /*7*/ 164 #include<stdio.h> 165 #include<ctype.h> 166 #include<math.h> 167 #define BASY_MONEY1 8.75 //基本工资 168 #define BASY_MONEY2 9.33 169 #define BASY_MONEY3 10.00 170 #define BASY_MONEY4 11.20 171 172 #define BASY_TIME 40 //基本工作时间 173 #define EXTR_TIME 1.5 //加班 174 175 #define LIN_MONEY1 300 //税率分界线 176 #define LIN_MONEY2 150 177 178 #define RATE1 0.15 //税率 179 #define RATE2 0.20 180 #define RATE3 0.25 181 int get_first(void); //创建函数，如果输入为空，则丢弃 182 int main(void) 183 { 184 char ch; 185 double basy_money; 186 double hours; 187 double sum; //工资总数 188 double rate_money; //税金 189 double income; //净收入 190 printf("*******************************************************\n"); 191 printf("输入与薪资或操作对应的编号进行操作：\n"); 192 printf("a) $8.75/hours \tb) $9.33/hours\n"); 193 printf("c) $10.00/hours \td) $11.20/hours\n"); 194 printf("q) 退出\n"); 195 printf("*******************************************************\n"); 196 while ((ch=get_first())!='q') //调用get_first()函数 197 { 198 if (ch =='\n') 199 continue; 200 ch = tolower(ch); //将大写字母转为小写 201 switch (ch) 202 { 203 case 'a': 204 basy_money = BASY_MONEY1; break; 205 case 'b': 206 basy_money = BASY_MONEY2; break; 207 case 'c': 208 basy_money = BASY_MONEY3; break; 209 case 'd': 210 basy_money = BASY_MONEY4; break; 211 default: 212 printf("请输入a-d进行选择（输入q退出）。\n请输入正确的数字\n"); break; 213 } 214 printf("输入一周工作小时数：\n"); 215 scanf_s("%lf", &hours); 216 if (hours <= BASY_TIME) 217 sum = basy_money * hours; 218 else 219 sum = basy_money * BASY_TIME + (hours - BASY_TIME)*basy_money*EXTR_TIME; 220 if (sum <= LIN_MONEY1) 221 rate_money = sum * RATE1; 222 else if (sum <= (LIN_MONEY1 + LIN_MONEY2)) 223 rate_money = LIN_MONEY1*RATE1 + (sum - LIN_MONEY1)*RATE2; 224 else 225 rate_money = LIN_MONEY1 * RATE1 + LIN_MONEY2 * RATE2 + BASY_MONEY2 + (sum - LIN_MONEY1 - LIN_MONEY2)*RATE3; 226 income = sum - rate_money; 227 printf("工资总额是：%.2lf\t税金是：%.2lf\t净收入是：%.2lf\n", sum, rate_money, income); 228 printf("输入下一个数字继续\n"); 229 } 230 getchar(); 231 return 0; 232 } 233 int get_first(void) 234 { 235 int ch; 236 ch = getchar(); 237 while (isspace(ch)) 238 ch = getchar(); 239 while (getchar() != '\n') 240 continue; 241 return ch; 242 } 243 /*8*/ 244 #include<stdio.h> 245 #include<ctype.h> 246 int get_first(void); 247 float get_num(void); 248 int main(void) 249 { 250 char ch; 251 float first, second; 252 printf("输入你想进行运算的选项：\n"); 253 printf("a.加法\ts.减法\n"); 254 printf("m.乘法\td.除法\n"); 255 printf("q.退出\n"); 256 while ((ch=get_first())!='q') 257 { 258 ch = tolower(ch); 259 if (ch != 'a'&& ch != 's'&& ch != 'm'&& ch != 'd') 260 { 261 printf("你只能输入a,s,m,d,q中的一个:"); 262 continue; 263 } 264 printf("输入第一个数："); 265 first = get_num(); 266 printf("输入第二个数："); 267 second = get_num(); 268 if (ch == 'd') 269 { 270 while (second == 0) 271 { 272 printf("输入一个大于0的数："); 273 second = get_num(); 274 } 275 } 276 switch (ch) 277 { 278 case 'a': 279 printf("%.1f+%.1f=%.1f\n", first, second, first + second); break; 280 case 's': 281 printf("%.1f-%.1f=%.1f\n", first, second, first - second); break; 282 case 'm': 283 printf("%.1f*%.1f=%.1f\n", first, second, first*second); break; 284 case 'd': 285 printf("%.1f/%.1f=%.1f\n", first, second, first / second); break; 286 default: 287 ; 288 break; 289 } 290 printf("输入你想进行运算的选项：\n"); 291 printf("a.加法\ts.减法\n"); 292 printf("m.乘法\td.除法\n"); 293 printf("q.退出\n"); 294 } 295 getchar(); 296 return 0; 297 } 298 int get_first(void) 299 { 300 int ch; 301 while ((ch = getchar()) == ' ' || ch == '\t' || ch == '\n') 302 continue; 303 while (getchar() != '\n') 304 continue; 305 return ch; 306 } 307 float get_num(void) 308 { 309 float input; 310 char ch; 311 while (scanf_s("%f",&input)!=1) 312 { 313 while ((ch = getchar()) != '\n') 314 putchar(ch); 315 printf("%c不是数字\n请输入例如2.5，-1.78E8，3之类的数字：",ch); 316 } 317 return input; 318 }
1 /****编程练习8****/ 2 /*1*/ 3 #include<stdio.h> 4 int main(void) 5 { 6 char ch; 7 int a = 0; 8 while ((ch=getchar())!=EOF) 9 a++; 10 printf("读取到%d个字符。\n", a); 11 getchar(); 12 return 0; 13 } 14 /*2*/ 15 #include<stdio.h> 16 int main(void) 17 { 18 char ch; 19 int i=0; //统计每行的值 20 while ((ch=getchar())!=EOF) 21 { 22 if (ch == '\n') 23 { 24 putchar('\\'); 25 putchar('n'); 26 printf(" %d\n", ch); 27 i = 0; 28 } 29 else if (ch == '\t') 30 { 31 putchar('\\'); 32 putchar('t'); 33 printf("%d\n", ch); 34 } 35 else if (ch < ' ') 36 { 37 putchar('^'); 38 putchar(ch + 64); 39 printf("%d\t", ch); 40 } 41 else 42 printf("%c %d\t", ch, ch); 43 if (++i == 10) 44 { 45 printf("\n"); 46 i = 0; 47 } 48 } 49 getchar(); 50 return 0; 51 } 52 /*3*/ 53 #include<stdio.h> 54 #include<ctype.h> 55 int main(void) 56 { 57 int ch; 58 //统计个数，用不到负数 59 unsigned A_count = 0; //大写 60 unsigned a_count = 0; //小写 61 unsigned oth_count = 0; //其他字符个数 62 while ((ch=getchar())!=EOF) 63 { 64 //if (isupper(ch)) //用isupper()函数判断是否为大写 65 if(ch>='A'&&ch<='Z') //可以用该行替换上一行，这种方法不用再调用ctype.h 66 A_count++; 67 else if (islower(ch)) //用islower()函数判断是否为小写 68 a_count++; 69 else 70 oth_count++; 71 } 72 printf("输入中大写字母有%d个\n", A_count); 73 printf("小写字母有%d个\n", a_count); 74 printf("其他字符有%d个\n", oth_count); 75 getchar(); 76 return 0; 77 } 78 /*4*/ 79 #include<stdio.h> 80 #include<ctype.h> 81 #include<stdbool.h> 82 int main(void) 83 { 84 char ch; 85 int words = 0, count = 0; //单词 字母总数 86 bool inword = false; //判断是否是一个单词 87 float average; 88 while ((ch=getchar())!=EOF) 89 { 90 if (isalpha(ch)) 91 count++; //如果是个字符，字母+1 92 if (!isspace(ch) && !inword) 93 { 94 inword = true; 95 words++; //如果不是空格且inword为true，单词+1 96 } 97 if (isspace(ch) && inword) 98 inword = false; //如果是个空格，且inword为true，此时并不是个完整单词，需要初始化inword 99 if (ispunct(ch)) 100 continue; //如果是字符，中断本次循环 101 } 102 average = count / words; 103 printf("平均每个单词有%.2f个字母", average); 104 getchar(); 105 return 0; 106 } 107 /*5*/ 108 #include<stdio.h> 109 int main(void) 110 { 111 int high = 100; 112 int low = 1; 113 int guess=(low+high)/2; 114 char response; 115 printf("你在1-100中选一个数字，我能猜出那个数字！"); 116 printf("\n如果我回答正确，就输入'y'"); 117 printf("\n如果我猜的数太高，就输入'h'"); 118 printf("\n如果我猜的数太小，就输入'l'\n"); 119 printf("你选择的数字是 %d?\n", guess); 120 while ((response=getchar())!='y') 121 { 122 if (response == '\n') 123 continue; 124 if (response != 'h'&&response != 'l') 125 { 126 printf("对不起，输入错误！请重新输入！\n"); 127 continue; 128 } 129 if (response == 'h') 130 high = guess - 1; 131 else if (response == 'l') 132 low = guess + 1; 133 guess = (high + low) / 2; 134 printf("你选择的数字是 %d?\n", guess); 135 } 136 printf("哈哈！我猜对了！\n"); 137 getchar(); 138 getchar(); 139 return 0; 140 } 141 /*6*/ 142 #include<stdio.h> 143 #include<ctype.h> 144 char get_first(void); 145 int main(void) 146 { 147 char ch; 148 ch = get_first(); 149 putchar(ch); 150 getchar(); 151 return 0; 152 } 153 char get_first(void) 154 { 155 char ch; 156 ch = getchar(); 157 while (isspace(ch)) 158 ch = getchar(); 159 while (getchar() != '\n') 160 continue; 161 return ch; 162 } 163 /*7*/ 164 #include<stdio.h> 165 #include<ctype.h> 166 #include<math.h> 167 #define BASY_MONEY1 8.75 //基本工资 168 #define BASY_MONEY2 9.33 169 #define BASY_MONEY3 10.00 170 #define BASY_MONEY4 11.20 171 172 #define BASY_TIME 40 //基本工作时间 173 #define EXTR_TIME 1.5 //加班 174 175 #define LIN_MONEY1 300 //税率分界线 176 #define LIN_MONEY2 150 177 178 #define RATE1 0.15 //税率 179 #define RATE2 0.20 180 #define RATE3 0.25 181 int get_first(void); //创建函数，如果输入为空，则丢弃 182 int main(void) 183 { 184 char ch; 185 double basy_money; 186 double hours; 187 double sum; //工资总数 188 double rate_money; //税金 189 double income; //净收入 190 printf("*******************************************************\n"); 191 printf("输入与薪资或操作对应的编号进行操作：\n"); 192 printf("a) $8.75/hours \tb) $9.33/hours\n"); 193 printf("c) $10.00/hours \td) $11.20/hours\n"); 194 printf("q) 退出\n"); 195 printf("*******************************************************\n"); 196 while ((ch=get_first())!='q') //调用get_first()函数 197 { 198 if (ch =='\n') 199 continue; 200 ch = tolower(ch); //将大写字母转为小写 201 switch (ch) 202 { 203 case 'a': 204 basy_money = BASY_MONEY1; break; 205 case 'b': 206 basy_money = BASY_MONEY2; break; 207 case 'c': 208 basy_money = BASY_MONEY3; break; 209 case 'd': 210 basy_money = BASY_MONEY4; break; 211 default: 212 printf("请输入a-d进行选择（输入q退出）。\n请输入正确的数字\n"); break; 213 } 214 printf("输入一周工作小时数：\n"); 215 scanf_s("%lf", &hours); 216 if (hours <= BASY_TIME) 217 sum = basy_money * hours; 218 else 219 sum = basy_money * BASY_TIME + (hours - BASY_TIME)*basy_money*EXTR_TIME; 220 if (sum <= LIN_MONEY1) 221 rate_money = sum * RATE1; 222 else if (sum <= (LIN_MONEY1 + LIN_MONEY2)) 223 rate_money = LIN_MONEY1*RATE1 + (sum - LIN_MONEY1)*RATE2; 224 else 225 rate_money = LIN_MONEY1 * RATE1 + LIN_MONEY2 * RATE2 + BASY_MONEY2 + (sum - LIN_MONEY1 - LIN_MONEY2)*RATE3; 226 income = sum - rate_money; 227 printf("工资总额是：%.2lf\t税金是：%.2lf\t净收入是：%.2lf\n", sum, rate_money, income); 228 printf("输入下一个数字继续\n"); 229 } 230 getchar(); 231 return 0; 232 } 233 int get_first(void) 234 { 235 int ch; 236 ch = getchar(); 237 while (isspace(ch)) 238 ch = getchar(); 239 while (getchar() != '\n') 240 continue; 241 return ch; 242 } 243 /*8*/ 244 #include<stdio.h> 245 #include<ctype.h> 246 int get_first(void); 247 float get_num(void); 248 int main(void) 249 { 250 char ch; 251 float first, second; 252 printf("输入你想进行运算的选项：\n"); 253 printf("a.加法\ts.减法\n"); 254 printf("m.乘法\td.除法\n"); 255 printf("q.退出\n"); 256 while ((ch=get_first())!='q') 257 { 258 ch = tolower(ch); 259 if (ch != 'a'&& ch != 's'&& ch != 'm'&& ch != 'd') 260 { 261 printf("你只能输入a,s,m,d,q中的一个:"); 262 continue; 263 } 264 printf("输入第一个数："); 265 first = get_num(); 266 printf("输入第二个数："); 267 second = get_num(); 268 if (ch == 'd') 269 { 270 while (second == 0) 271 { 272 printf("输入一个大于0的数："); 273 second = get_num(); 274 } 275 } 276 switch (ch) 277 { 278 case 'a': 279 printf("%.1f+%.1f=%.1f\n", first, second, first + second); break; 280 case 's': 281 printf("%.1f-%.1f=%.1f\n", first, second, first - second); break; 282 case 'm': 283 printf("%.1f*%.1f=%.1f\n", first, second, first*second); break; 284 case 'd': 285 printf("%.1f/%.1f=%.1f\n", first, second, first / second); break; 286 default: 287 ; 288 break; 289 } 290 printf("输入你想进行运算的选项：\n"); 291 printf("a.加法\ts.减法\n"); 292 printf("m.乘法\td.除法\n"); 293 printf("q.退出\n"); 294 } 295 getchar(); 296 return 0; 297 } 298 int get_first(void) 299 { 300 int ch; 301 while ((ch = getchar()) == ' ' || ch == '\t' || ch == '\n') 302 continue; 303 while (getchar() != '\n') 304 continue; 305 return ch; 306 } 307 float get_num(void) 308 { 309 float input; 310 char ch; 311 while (scanf_s("%f",&input)!=1) 312 { 313 while ((ch = getchar()) != '\n') 314 putchar(ch); 315 printf("%c不是数字\n请输入例如2.5，-1.78E8，3之类的数字：",ch); 316 } 317 return input; 318 }
1 /*********编程练习9***********/ 2 /*复习题9*/ 3 #include<stdio.h> 4 void mennu(void); //菜单函数 5 int limt(int up, int down); //上下限函数 6 int main(void) 7 { 8 int ch; 9 mennu(); 10 while ((ch=limt(4,1))!=4) 11 { 12 printf("%d一个正确的选择！\n",ch); 13 mennu(); 14 } 15 getchar(); 16 getchar(); 17 getchar(); 18 return 0; 19 } 20 void mennu(void) 21 { 22 printf("请选择列表中对应的数字：\n"); 23 printf("1) 复制文件 \t2) 移动文件\n"); 24 printf("3) 删除文件 \t4) 退出\n"); 25 printf("输入你选择的数字：\n"); 26 } 27 int limt(int up, int down) 28 { 29 int input; 30 int a=scanf_s("%d", &input); 31 while (a==1&&(input > up || input < down)) 32 { 33 printf("输入数值超过限制!\n"); 34 mennu(); 35 scanf_s("%d", &input); 36 } 37 if (a!=1) 38 { 39 printf("没有数字输入!\n"); 40 input = 4; 41 } 42 return input; 43 } 44 /*编程练习1*/ 45 #include<stdio.h> 46 double min(double x, double y); 47 int main(void) 48 { 49 double a, b; 50 printf("输入两个小数，将输出较小的值（输入q退出）：\n"); 51 while (scanf_s("%lf %lf", &a, &b)==2) 52 { 53 printf("%lf和%lf中较小的数是：%lf", a, b, min(a, b)); 54 printf("继续输入进行比较（输入q退出）：\n"); 55 } 56 getchar(); 57 return 0; 58 } 59 double min(double x, double y) 60 { 61 return x < y ? x : y; 62 } 63 /*2*/ 64 #include<stdio.h> 65 void chline(char ch, int i, int j); 66 int main(void) 67 { 68 char c; 69 int row; 70 int clum; 71 printf("该程序要求输入一个字符并按输入的行列数打印\n"); 72 printf("输入你想打印的字符："); 73 scanf_s("%c", &c); 74 printf("输入你想打印的行和列（用空格分开）："); 75 scanf_s("%d %d", &row, &clum); 76 printf("\n"); 77 chline(c, row, clum); 78 getchar(); 79 getchar(); 80 return 0; 81 82 } 83 void chline(char ch, int i, int j) 84 { 85 for (int x = 0; x < i; x++) 86 { 87 for (int y = 0; y < j; y++) 88 putchar(ch); 89 putchar('\n'); 90 } 91 } 92 /*3*/ 93 #include<stdio.h> 94 void chline(char ch, int i, int j); 95 int main(void) 96 { 97 char ch; 98 int row, clo; 99 printf("输入想要打印的字符："); 100 while ((ch=getchar())!='#') 101 { 102 if (ch == '\n') 103 continue; 104 printf("输入想要打印的次数和行数："); 105 if (scanf_s("%d %d", &clo, &row) != 2) 106 break; 107 chline(ch, clo, row); 108 printf("继续输入下一个想打印的字符（输入#退出）："); 109 } 110 getchar(); 111 return 0; 112 } 113 void chline(char ch, int i, int j) 114 { 115 for (int x = 0; x < i; x++) 116 { 117 for (int y = 0; y < j; y++) 118 putchar(ch); 119 putchar('\n'); 120 } 121 } 122 /*4*/ 123 #include<stdio.h> 124 double Har_average(double num1, double num2); //调和平均数 125 int main(void) 126 { 127 double a = 3.14, b = 3.15, c; 128 c=Har_average(a, b); 129 printf("%lf", c); 130 getchar(); 131 return 0; 132 } 133 double Har_average(double num1, double num2) 134 { 135 double down_num1, down_num2, down_avweage; 136 down_num1 = 1 / num1; 137 down_num2 = 1 / num2; 138 down_avweage = 1 / ((down_num1 + down_num2) / 2); 139 return down_avweage; 140 } 141 /*5*/ 142 #include<stdio.h> 143 void large_of(double *p1, double *p2); 144 int main(void) 145 { 146 double a, b; 147 printf("输入两个值："); 148 while (scanf_s("%lf %lf",&a,&b)==2) 149 { 150 large_of(&a, &b); 151 printf("交换后的值为%lf和%lf\n", a, b); 152 printf("继续输入（输入q退出）："); 153 } 154 getchar(); 155 return 0; 156 } 157 void large_of(double *p1, double *p2) 158 { 159 if (*p1 > *p2) 160 *p2 = *p1; 161 else 162 *p1 = *p2; 163 } 164 /*6*/ 165 #include<stdio.h> 166 void change(double *p1, double *p2, double*p3); 167 int main(void) 168 { 169 double a, b, c; 170 while (scanf_s("%lf %lf %lf", &a, &b,&c) == 3) 171 { 172 change(&a, &b, &c); 173 printf("交换后的值为%lf和%lf和%f\n", a, b,c); 174 printf("继续输入（输入q退出）："); 175 } 176 getchar(); 177 return 0; 178 } 179 void change(double *p1, double *p2, double *p3) 180 { 181 double max, min, mid; 182 max = *p1; 183 if (max < *p2) 184 max = *p2; 185 if (max < *p3) 186 max = *p3; 187 min = *p1; 188 if (min > *p2) 189 min = *p2; 190 if (min > *p3) 191 min = *p3; 192 mid = *p1 + *p2 + *p3 - max - min; 193 *p1 = min; 194 *p2 = mid; 195 *p3 = max; 196 } 197 /*7*/ 198 #include<stdio.h> 199 #include<ctype.h> 200 int report(char ch); 201 int main(void) 202 { 203 char ch; 204 int pos; //数值位置 205 printf("请输入字符："); 206 while ((ch=getchar())!=EOF) 207 { 208 if (ch == '\n') 209 { 210 continue; 211 } 212 pos = report(ch); 213 if (pos == -1) 214 { 215 printf("%c不是字母！\n", ch); 216 } 217 else 218 { 219 printf("%c在字母表中的位置是%d!\n", ch, pos); 220 } 221 printf("继续输入:"); 222 } 223 getchar(); 224 return 0; 225 } 226 int report(char ch) 227 { 228 if (isalpha(ch)) //判断是否为字母 229 { 230 return toupper(ch) - 'A' + 1; //将小写转换为大写；也可以将大写转换为小写，‘A’要改为‘a’ 231 } 232 else 233 { 234 return -1; 235 } 236 } 237 /*8*/ 238 #include<stdio.h> 239 double power(double n, int p); 240 int main(void) 241 { 242 double x, xpow; 243 int exp; 244 printf("输入数字和指数，计算整数幂结果（q退出）："); 245 while (scanf_s("%lf %d",&x,&exp)==2) 246 { 247 xpow = power(x, exp); 248 if (xpow == 1) 249 continue; 250 printf("%.3g的%d次幂为%.5g\n", x, exp, xpow); 251 printf("继续输入（q退出）："); 252 } 253 getchar(); 254 return 0; 255 } 256 double power(double n, int p) 257 { 258 double pow = 1; 259 if (p == 0) 260 { 261 if (n==0) 262 { 263 printf("0的0次幂未定义，请输入其它值:\n"); 264 } 265 pow = 1; 266 } 267 else if (p==0) 268 { 269 pow = 0; 270 } 271 else if (p>0) 272 { 273 for (int i = 1; i <= p; i++) 274 { 275 pow *= n; 276 } 277 } 278 else 279 { 280 pow = 1 / power(n, -p); //运用了递归 281 ///////不用递归的写法：for(int i=1; i <= -p; i++) 282 ////////////////// { 283 //////////////////////////// pow*=n; 284 //////////////////////////// } //此种方法返回的是 1/pow 285 } 286 return pow; 287 } 288 /*9*/ 289 ////上题所示///////// 290 /*10*/ 291 #include<stdio.h> 292 void to_base_n(int x, int system); 293 int main(void) 294 { 295 int num; 296 int system_num; 297 int status; 298 printf("输入一个整数："); 299 while (scanf_s("%d",&num)==1) 300 { 301 printf("输入进制（2-10）:"); 302 while ((status=scanf_s("%d",&system_num))==1&&(system_num<2||system_num>10)) 303 { 304 printf("输入进制超过限定值，请输入2-10之间的数字："); 305 } 306 if (status != 1) 307 break; 308 to_base_n(num, system_num); 309 printf("\n"); 310 printf("继续输入一个整数（q退出）："); 311 } 312 getchar(); 313 return 0; 314 } 315 void to_base_n(int x, int system) 316 { 317 int r; 318 r = x % system; 319 if (x >= system) 320 { 321 to_base_n(x / system, system); //递归 322 } 323 putchar('0' + r); //因为putchar()函数只能输出字符，我们要输出的是字符，所以运用ASCALL码值加上r 324 } 325 /*11*/ 326 #include<stdio.h> 327 void Fibonacci(int n); 328 int main(void) 329 { 330 int n; 331 printf("输入整数："); 332 while ((scanf_s("%d",&n)==1)) 333 { 334 Fibonacci(n); 335 printf("继续输入（q退出）："); 336 } 337 getchar(); 338 return 0; 339 } 340 void Fibonacci(int n) 341 { 342 int f1, f2, f3; 343 printf("斐波那契是："); 344 for (int i = 1; i <= n; i++) 345 { 346 if (i == 1) 347 { 348 f1 = 1; 349 printf("%d", f1); 350 } 351 else if (i==2) 352 { 353 f2 = 1; 354 printf("%d", f2); 355 } 356 else 357 { 358 f3 = f2 + f1; 359 f1 = f2; 360 f2 = f3; 361 printf("%d", f3); 362 } 363 putchar(' '); 364 } 365 putchar('\n'); 366 }
1 /********编程练习10**********/ 2 /*1*/ 3 #include<stdio.h> 4 #define MONTHS 12 5 #define YEARS 5 6 int main(void) 7 { 8 const float rain[YEARS][MONTHS] = //2010-2014年降水量 9 { 10 {4.3,4.3,4.3,3.0,2.0,1.2,0.2,0.2,0.4,2.4,3.5,6.6}, 11 {8.5,8.2,1.2,1.6,2.4,0.0,5.2,0.9,0.3,0.9,1.4,7.3}, 12 {9.1,8.5,6.7,4.3,2.1,0.8,0.2,0.2,1.1,2.3,6.1,8.4}, 13 {7.2,9.9,8.4,3.3,1.2,0.8,0.4,0.0,0.6,1.7,4.3,6.2}, 14 {7.6,5.6,3.8,2.8,3.8,0.2,0.0,0.0,0.0,1.3,2.6,5.2} 15 }; 16 int year, month; 17 float subtot, total; //初始化要放在循环中 18 printf("年份\t降水量\n"); 19 for (year = 0,total=0; year < YEARS; year++) 20 { 21 for (month = 0,subtot = 0; month < MONTHS; month++) 22 subtot += *(*(rain + year) + month); //每年每月降水量 23 printf("%d\t%.1f\n", 2010 + year, subtot); 24 total += subtot; //5年总降水量 25 } 26 printf("\n每年的平均降水量为：%.1f\n", total / YEARS); 27 printf("每月5年中平均降水量：\n"); 28 printf(" 1 2 3 4 5 6 7 8 9 10 11 12\n"); 29 for (month = 0; month < MONTHS; month++) 30 { 31 for (year = 0, subtot = 0; year < YEARS; year++) 32 { 33 subtot += *(*(rain + year) + month); 34 } 35 printf("%4.1f", subtot / YEARS); 36 } 37 getchar(); 38 return 0; 39 } 40 /*2*/ 41 #include<stdio.h> 42 void copy_arr(double target[], double source[], int n); 43 void copy_ptr(double *target, double *source, int n); 44 void copy_ptrs(double *target, double *source_begin, int *source_end ); 45 int main(void) 46 { 47 int i; 48 double source[5] = { 1.1, 2.2, 3.3, 4.4, 5.5 }; 49 double target1[5]; 50 double target2[5]; 51 double target3[5]; 52 printf("source: "); 53 for ( i = 0; i < 5; i++) 54 { 55 printf("%.1lf", source[i]); 56 printf(" "); 57 } 58 putchar('\n'); 59 copy_arr(target1, source, 5); 60 printf("target1:"); 61 for (i = 0; i < 5; i++) 62 { 63 printf("%.1lf", target1[i]); 64 putchar(' '); 65 } 66 putchar('\n'); 67 copy_ptr(target2, source, 5); 68 printf("target2:"); 69 for ( i = 0; i < 5; i++) 70 { 71 printf("%.1lf", *(target2 + i)); 72 putchar(' '); 73 } 74 putchar('\n'); 75 copy_ptrs(target3, source, source+5); 76 printf("target3:"); 77 for (i = 0; i < 5; i++) 78 { 79 printf("%.1lf", target3[i]); 80 putchar(' '); 81 } 82 putchar('\n'); 83 getchar(); 84 return 0; 85 } 86 void copy_arr(double target[], double source[], int n) 87 { 88 for (int i = 0; i < n; i++) 89 { 90 target[i] = source[i]; 91 } 92 } 93 void copy_ptr(double *target, double *source, int n) 94 { 95 for (int i = 0; i < n; i++) 96 { 97 *(target + i) = *(source + i); 98 } 99 } 100 void copy_ptrs(double *target, double *source_begin, int *source_end) 101 { 102 while (source_begin < source_end) 103 { 104 *target = *source_begin; 105 target++; 106 source_begin++; 107 } 108 } 109 /*3*/ 110 #include<stdio.h> 111 #define SIZE 10 112 void show_arr(const arr[], int n); 113 int max_arr(const arr[], int n); 114 int main(void) 115 { 116 int arr[SIZE] = { 1,2,3,4,5,6,7,8,9,10 }; 117 int max; 118 show_arr(arr, SIZE); 119 max = max_arr(arr, SIZE); 120 printf("%d是数组中的最大值。\n", max); 121 getchar(); 122 return 0; 123 } 124 int max_arr(const arr[], int n) 125 { 126 int max = arr[0]; 127 for (int i = 0; i < n; i++) 128 { 129 if (max < arr[i]) 130 max = arr[i]; 131 } 132 return max; 133 } 134 void show_arr(const arr[], int n) 135 { 136 for (int i = 0; i < n; i++) 137 { 138 printf("%d", arr[i]); 139 putchar(' '); 140 } 141 putchar('\n'); 142 } 143 /*4*/ 144 #include<stdio.h> 145 #define SIZE 10 146 double max(const arr[], int n); 147 void show_arr(const arr[], int n); 148 int main(void) 149 { 150 int arr[SIZE] = { 1,2,3,4,5,6,7,8,9,10 }; 151 int max_sub; 152 show_arr(arr, SIZE); 153 max_sub = max(arr, SIZE); 154 printf("最大值的下标是%d\n", max_sub); 155 getchar(); 156 return 0; 157 } 158 double max(const arr[], int n) 159 { 160 int max = arr[0]; 161 int sub; //最大值下标 162 for (int i = 0; i < n; i++) 163 { 164 if (max < arr[i]) 165 max = arr[i]; 166 sub = i; 167 } 168 return sub; 169 } 170 void show_arr(const arr[], int n) 171 { 172 for (int i = 0; i < n; i++) 173 { 174 printf("%d", arr[i]); 175 putchar(' '); 176 } 177 putchar('\n'); 178 } 179 /*5*/ 180 #include<stdio.h> 181 #define SIZE 10 182 double diff_val(const double arr[], int n); 183 int main(void) 184 { 185 double arr[SIZE] = { 1,2,3,4,5,6,7,8,9,10 }; 186 double value; 187 value = diff_val(arr, SIZE); 188 printf("最大值与最小值的差是%lf\n", value); 189 getchar(); 190 return 0; 191 } 192 double diff_val(const double arr[], int n) 193 { 194 double max = arr[0]; 195 double min = arr[0]; 196 for (int i = 0; i < n; i++) 197 { 198 if (max < arr[i]) 199 { 200 max = arr[i]; 201 } 202 else if(min>arr[i]) 203 { 204 min = arr[i]; 205 } 206 } 207 return max - min; 208 } 209 /*6*/ 210 #include<stdio.h> 211 #define SIZE 10 212 void reverse(double arr[], int n); 213 int main(void) 214 { 215 double arr[SIZE] = { 11,33, 22,44,66,55,77,88,99,10 }; 216 printf("排序前的结果是："); 217 for (int i = 0; i < SIZE; i++) 218 { 219 printf("%.2lf", arr[i]); 220 putchar(' '); 221 } 222 putchar('\n'); 223 reverse(arr, SIZE); 224 printf("排序后的结果是："); 225 for (int i = 0; i < SIZE; i++) 226 { 227 printf("%.2lf", arr[i]); 228 putchar(' '); 229 } 230 putchar('\n'); 231 getchar(); 232 return 0; 233 } 234 void reverse(double arr[], int n) 235 { 236 for (int i = 0; i < n / 2; i++) 237 { 238 double tmp = arr[i]; 239 arr[i] = arr[n - 1 - i]; 240 arr[n - 1 - i] = tmp; 241 } 242 } 243 /*7*/ 244 #include<stdio.h> 245 #define ROWS 3 //行 246 #define COLS 4 //列 247 void copy_arr(double target_arr[][COLS], double source_arr[][COLS], int row); 248 int main(void) 249 { 250 double source_arr[ROWS][COLS] = 251 { 252 {1.1,2.2,3.3,4.4}, 253 {2.2,2.3,2.4,2.5}, 254 {3.3,4.4,5.5,6.6} 255 }; 256 double target_arr[ROWS][COLS]; 257 copy_arr(target_arr, source_arr, ROWS); 258 printf("结果为：\n"); 259 for (int i = 0; i < ROWS; i++) 260 { 261 for (int j = 0; j < COLS; j++) 262 { 263 printf("%.2lf", target_arr[i][j]); 264 putchar(' '); 265 } 266 putchar('\n'); 267 } 268 getchar(); 269 return 0; 270 } 271 void copy_arr(double target_arr[][COLS], double source_arr[][COLS], int row) 272 { 273 for (int i = 0; i < row; i++) 274 { 275 for (int j = 0; j < COLS; j++) 276 { 277 target_arr[i][j] = source_arr[i][j]; 278 } 279 } 280 } 281 /*8*/ 282 #include<stdio.h> 283 #define SIZE1 7 284 #define SIZE2 3 285 void copy_arr(int target_arr[],const int source_arr[], int n); 286 int main(void) 287 { 288 int source_arr[SIZE1] = { 1,2,3,4,5,6,7 }; 289 int target_arr[SIZE2]; 290 int values; 291 copy_arr(target_arr, source_arr + 2, SIZE2); 292 for (int i = 0; i < SIZE2; i++) 293 { 294 printf("%d", target_arr[i]); 295 putchar(' '); 296 } 297 printf("\n"); 298 getchar(); 299 return 0; 300 } 301 void copy_arr(int target_arr[], const int source_arr[], int n) 302 { 303 for (int i = 0; i < n; i++) 304 { 305 target_arr[i] = source_arr[i]; 306 } 307 } 308 /*9*/ 309 #include<stdio.h> 310 void copy_arr(int rows, double target_arr[][5],double source_arr[][5]); 311 void show_arr(int rows, double target_arr[][5], double source_arr[][5]); 312 int main(void) 313 { 314 double source_arr[3][5] = 315 { 316 {1.1,2.2,3.3,4.4,5.5}, 317 {2.2,3.3,4.4,5.5,6.6}, 318 {3.3,4.4,5.5,6.6,7.7} 319 }; 320 double target_arr[3][5]; 321 copy_arr(3, target_arr, source_arr); 322 show_arr(3, target_arr, source_arr); 323 getchar(); 324 return 0; 325 } 326 void copy_arr(int rows, double target_arr[][5], double source_arr[][5]) 327 { 328 for (int i = 0; i < rows; i++) 329 { 330 for (int j = 0; j < 5; j++) 331 { 332 target_arr[i][j] = source_arr[i][j]; 333 } 334 } 335 } 336 void show_arr(int rows, double target_arr[][5], double source_arr[][5]) 337 { 338 for (int i = 0; i < rows; i++) 339 { 340 for (int j = 0; j < 5; j++) 341 { 342 printf("%.2lf", source_arr[i][j]); 343 putchar(' '); 344 } 345 } 346 putchar('\n'); 347 for (int i = 0; i < rows; i++) 348 { 349 for (int j = 0; j < 5; j++) 350 { 351 printf("%.2lf", target_arr[i][j]); 352 putchar(' '); 353 } 354 } 355 putchar('\n'); 356 } 357 /*10*/ 358 #include<stdio.h> 359 void add_arr(int source_arr1[], int source_arr2[], int target_arr[], int n); 360 int main(void) 361 { 362 int source_arr1[4] = { 2,4,5,8 }; 363 int source_arr2[4] = { 1,0,4,6 }; 364 int target_arr[4]; 365 add_arr(source_arr1, source_arr2, target_arr, 4); 366 for (int i = 0; i < 4; i++) 367 { 368 printf("%d", target_arr[i]); 369 putchar(' '); 370 } 371 putchar('\n'); 372 getchar(); 373 return 0; 374 } 375 void add_arr(int source_arr1[], int source_arr2[], int target_arr[], int n) 376 { 377 for (int i = 0; i < n; i++) 378 { 379 target_arr[i] = source_arr1[i] + source_arr2[i]; 380 } 381 } 382 /*11*/ 383 #include<stdio.h> 384 void times2_arr(int source_arr[][5], int target_arr[][5], int rows); 385 void show_arr(int source_arr[][5], int target_arr[][5], int rows); 386 int main(void) 387 { 388 int source_arr[3][5] = 389 { 390 {1,2,3,4,5}, 391 {2,3,4,5,6}, 392 {3,4,5,6,7} 393 }; 394 int target_arr[3][5]; 395 times2_arr(source_arr, target_arr, 3); 396 show_arr(source_arr, target_arr, 3); 397 putchar('\n'); 398 getchar(); 399 return 0; 400 } 401 void times2_arr(int source_arr[][5], int target_arr[][5], int rows) 402 { 403 for (int i = 0; i < rows; i++) 404 { 405 for (int j = 0; j < 5; j++) 406 { 407 target_arr[i][j] = 2*source_arr[i][j]; 408 } 409 } 410 } 411 void show_arr(int source_arr[][5], int target_arr[][5], int rows) 412 { 413 for (int i = 0; i < rows; i++) 414 { 415 for (int j = 0; j < 5; j++) 416 { 417 printf("%4d", source_arr[i][j]); 418 //putchar(' '); 419 //putchar(' '); 420 } 421 } 422 putchar('\n'); 423 for (int i = 0; i < rows; i++) 424 { 425 for (int j = 0; j < 5; j++) 426 { 427 printf("%4d", target_arr[i][j]); 428 //putchar(' '); 429 } 430 } 431 putchar('\n'); 432 } 433 /*12*/ 434 #include<stdio.h> 435 #define YEARS 5 436 #define MONTHS 12 437 void total_rain(const float rain[][MONTHS], int years); 438 void average(const float rain[][MONTHS], int years); 439 int main(void) 440 { 441 const float rain[YEARS][MONTHS] = //2010-2014年降水量 442 { 443 {4.3,4.3,4.3,3.0,2.0,1.2,0.2,0.2,0.4,2.4,3.5,6.6}, 444 {8.5,8.2,1.2,1.6,2.4,0.0,5.2,0.9,0.3,0.9,1.4,7.3}, 445 {9.1,8.5,6.7,4.3,2.1,0.8,0.2,0.2,1.1,2.3,6.1,8.4}, 446 {7.2,9.9,8.4,3.3,1.2,0.8,0.4,0.0,0.6,1.7,4.3,6.2}, 447 {7.6,5.6,3.8,2.8,3.8,0.2,0.0,0.0,0.0,1.3,2.6,5.2} 448 }; 449 total_rain(rain, YEARS); 450 printf("JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NEV DEC\n"); 451 average(rain, YEARS); 452 putchar('\n'); 453 getchar(); 454 return 0; 455 } 456 void total_rain(const float rain[][MONTHS], int years) 457 { 458 int i, j; 459 float subtotal,total = 0; 460 for ( i = 0; i < years; i++) //每次循环需要将total归零。因为计算的是每年每月降水量 461 { 462 for ( j = 0, subtotal = 0; j < MONTHS; j++) 463 { 464 subtotal += rain[i][j]; 465 } 466 printf("%d\t%.1f\n", 2010 + i, subtotal); 467 total += subtotal; 468 } 469 printf("5年总降水量为%.1f\n", total / years); 470 } 471 void average(const float rain[][MONTHS], int years) 472 { 473 int i, j; 474 float subtotal; 475 for ( i = 0; i < MONTHS; i++) 476 { 477 for ( j = 0, subtotal = 0; j < years; j++) 478 { 479 subtotal += rain[j][i]; 480 } 481 printf("%-4.1f", subtotal / years); 482 } 483 } 484 /*13*/ 485 #include<stdio.h> 486 void input_arr(double arr[][5], int rows); 487 double average_cols(double arr[], int cols); 488 double average_all(double arr[][5], int rows); 489 double max_arr(double arr[][5], int rows); 490 void show_arr(double arr[][5], int rows); 491 int main(void) 492 { 493 double arr[3][5]; 494 printf("输入15个浮点值：\n"); 495 input_arr(arr, 3); 496 putchar('\n'); 497 for (int i = 0; i < 3; i++) 498 { 499 printf("%d组数据的平均值是%lf\n", i+1, average_cols(arr[i], 5)); 500 } 501 printf("所有数据的平均值是%lf\n", average_all(arr, 3)); 502 printf("15个数据中最大值为：%lf\n", max_arr(arr, 3)); 503 show_arr(arr, 3); 504 getchar(); 505 return 0; 506 } 507 void input_arr(double arr[][5], int rows) 508 { 509 for (int i = 0; i < rows; i++) 510 { 511 printf("请输入第%d组数据：\n", i + 1); 512 for (int j = 0; j < 5; j++) 513 { 514 scanf_s("%lf", &arr[i][j]); 515 getchar(); 516 } 517 } 518 } 519 double average_cols(double arr[], int cols) 520 { 521 double sum = 0.0; 522 for (int i = 0; i < cols; i++) 523 { 524 sum += arr[i]; 525 } 526 return (sum / cols); 527 } 528 double average_all(double arr[][5], int rows) 529 { 530 double sum = 0.0; 531 for (int i = 0; i < rows; i++) 532 { 533 for (int j = 0; j < 5; j++) 534 { 535 sum += arr[i][j]; 536 } 537 } 538 return (sum / (5 * rows)); 539 } 540 double max_arr(double arr[][5], int rows) 541 { 542 double max = 0.0; 543 for (int i = 0; i < rows; i++) 544 { 545 for (int j = 0; j < 5; j++) 546 { 547 if (max<arr[i][j]) 548 { 549 max = arr[i][j]; 550 } 551 } 552 } 553 return max; 554 } 555 void show_arr(double arr[][5], int rows) 556 { 557 for (int i = 0; i < rows; i++) 558 { 559 for (int j = 0; j < 5; j++) 560 { 561 printf("%lf", arr[i][j]); 562 putchar(' '); 563 } 564 putchar('\n'); 565 } 566 } 567 /*14*/ 568 //////////////我的vs2017似乎不支持变长数组，但大致定义如下 569 /*#include<stdio.h> 570 #define ROWS 3 571 #define COLS 5 572 void input_arr(int rows,int cols, double arr[rows][cols]); 573 double average_cols(int cols,double arr[cols]); 574 double average_all(int rows, int cols, double arr[rows][cols]); 575 double max_arr(int rows, int cols, double arr[rows][cols]); 576 void show_arr(int rows, int cols, double arr[rows][cols]); 577 int main(void) 578 { 579 580 getchar(); 581 return 0; 582 }*/
