加减法画面感的优化

  1 #include "stdafx.h"
  2 #include "stdio.h"
  3 #include "stdlib.h"
  4 #include "time.h" 
  5 #include "stdlib.h"
  6 int gys(int a,int b);
  7 int gbs(int a,int b);
  8 int yue(int a,int b);
  9 int fen(int a,int b);
 10 
 11 
 12 int main(int argc, char* argv[])
 13 {    bool Decide;
 14     float m,n,result,answer;
 15     int i=0,flag,flog,r;
 16     int a,b,c,d;
 17     int u1,u2,v,x,m1,n1,q,p;
 18     int result1,answer1;
 19     srand(time(0));
 20     while(i<30)
 21     {
 22         flag=rand()%5;
 23         m = rand()%10;
 24         n = rand()%10;
 25         a = rand()%10;
 26         b = rand()%10;
 27         c = rand()%10;
 28         d = rand()%10;
 29         switch (flag)
 30         {
 31         case 0:
 32                 system("cls");   
 33                 printf("\n\n\n\n\n\n\n");
 34                    printf("              %0.2f+%0.2f=",m,n);
 35                 result = m+n;
 36                 scanf("%f",&answer);
 37                 if(result == answer)
 38                      Decide = true;
 39                    else
 40                     Decide = false;
 41             break;
 42         case 1:
 43                 system("cls");  
 44                 printf("\n\n\n\n\n\n\n");
 45                 printf("              %0.2f-%0.2f=",m,n);
 46                 result = m-n;
 47                 scanf("%f",&answer);
 48                 if(result == answer)
 49                     Decide = true;
 50                 else
 51                     Decide = false;            
 52             
 53             break;
 54         case 2:
 55                 system("cls");  
 56                 printf("\n\n\n\n\n\n\n");
 57                 printf("              %0.2f*%0.2f=",m,n);
 58                 result = m*n;
 59                 scanf("%f",&answer);
 60                 if(result == answer)
 61                     Decide = true;
 62                 else
 63                     Decide = false;            
 64             
 65             break;
 66         case 3:
 67                 system("cls"); 
 68                 printf("\n\n\n\n\n\n\n");
 69                 if (n==0)
 70                 continue;
 71                 printf("              %0.2f/%0.2f=",m,n);
 72                 result= m/n;
 73                 scanf("%f",&answer);
 74                 r=(int)m%(int)n;
 75                 if (r==0)
 76                     printf("              结果余数为零\n");
 77                 else                            
 78                     printf("              余数是%d\n",r);
 79                 if(result == answer)
 80                     Decide = true;
 81                 else
 82                     Decide = false;    
 83                 break;
 84         case 4:    
 85                 system("cls");  
 86                 printf("\n\n\n\n\n\n\n");
 87                 flog=rand()%4;
 88               printf("              计算结果,格式为分数\n");
 89                 system("pause");
 90               if (b==0)
 91                  continue;
 92               if (d==0)
 93                  continue;
 94             switch (flog)
 95             {
 96                 case 0 :
 97                     system("cls");   
 98                        printf("\n\n\n\n\n\n\n");
 99                     printf("              %d/%d+%d/%d=",a,b,c,d);    //分数加法
100                     x=gbs(b,d);
101                     u1=x/b*a;
102                     u2=x/d*c;
103                     v=u1+u2;
104                     m1=yue(v,x);
105                     n1=fen(v,x);
106                     result1=m1/n1;
107                      scanf("%d/%d",&q,&p);
108                        answer1=q/p;
109                     if(result1 == answer1)
110                           Decide = true;
111                     else
112                         Decide = false;    
113                      break;
114                 case 1:    
115                     system("cls");  
116                     printf("\n\n\n\n\n\n\n");
117                     printf("              %d/%d*%d/%d=",a,b,c,d);     //分数乘法
118                     int u3,u4;
119                     u3=a*c;
120                     u4=b*d;
121                     m1=yue(u3,u4);
122                     n1=fen(u3,u4);
123                     result1=m1/n1;
124                      scanf("%d/%d",&q,&p);
125                     answer1=q/p; 
126                     if(result1 == answer1)
127                           Decide = true;
128                     else
129                         Decide = false;    
130                      break;
131                 case 2:
132                     system("cls");  
133                     printf("\n\n\n\n\n\n\n");
134                     printf("              %d/%d-%d/%d=",a,b,c,d);    //分数减法
135                     int u5,u6,v1,x1;
136                     x1=gbs(b,d);
137                     u5=x1/b*a;
138                     u6=x1/d*c;
139                     v1=u5-u6;
140                     m1=yue(v1,x1);
141                     n1=fen(v1,x1);
142                     result1=m1/n1;
143                      scanf("%d/%d",&q,&p);
144                     answer1=q/p; 
145                     if(result1 == answer1)
146                           Decide = true;
147                     else
148                         Decide = false;    
149                      break;
150                    case 3:    
151                     system("cls");
152                     printf("\n\n\n\n\n\n\n");
153                     printf("              %d/%d/%d/%d=",a,b,c,d);     //分数除法
154                     int u7,u8;
155                     u7=a*d;
156                     u8=b*c;
157                     m1=yue(u7,u8);
158                     n1=fen(u7,u8);
159                     result1=m1/n1;
160                      scanf("%d/%d",&q,&p);
161                     answer1=q/p; 
162                     if(result1 == answer1)
163                           Decide = true;
164                     else
165                         Decide = false;    
166                      break;
167                 default: printf ("程序运行错误,请稍后重试!\n");
168                             system("pause");
169                    break;                            
170             }              
171            break;
172 
173         default: printf ("程序运行错误,请稍后重试!\n");
174                     system("pause");
175             break;
176         }
177         if (flag==4)
178         {
179             if(Decide == true)
180             {
181                 printf("              答案正确\n");
182                  system("pause");
183             }
184             else
185             {
186                 printf("              答案错误   正确答案是 %d/%d\n",m1,n1);
187                 system("pause");
188             }
189         }
190     
191         else
192         {
193                 if(Decide == true)
194                 {
195                     printf("              答案正确\n");
196                         system("pause");
197                 }
198                 else
199                 {
200                     printf("              答案错误   正确答案是 %0.2f\n",result);
201                         system("pause");
202                 }
203         }
204     
205 
206     
207     }
208     return 0;
209 }
210 
211 
212 
213 
214 int gys(int a,int b)   //求最大公约数
215 {
216     return b?gys(b,a%b):a;
217 }
218 
219 int gbs(int a,int b)    //求最小公倍数
220 {
221     return a*b/gys(a,b);
222 }
223 
224 int yue(int a,int b)
225 {
226     int c,fz;
227     c=gys(a,b);
228     fz=a/c;
229 return fz;
230 }
231 
232 int fen(int a,int b)
233 {
234     int c,fm;
235     c=gys(a,b);
236 
237     fm=b/c;
238 return fm;
239 }

之前呢,加减法的程序功能完成的差不多,但感觉运行出来的结果画面太差了,感觉乱糟糟的。有密集恐惧症的人估计都要吐了吧!所以呢,我用

system("cls");进行了一下清屏,现在看着好多了。
以前程序遇到除数为零的情况时,除数会自动加一,有点简单粗暴。现在更简单了,用了一个continue直接跳出这次循环。顺道复习了一下break和continue的用法和不同点。

break

(1)break语句只能用于由while语句,do-while语句或for语句构成的循环结构中和switch选择结构中。

(2) 在嵌套循环的情况下,break语句只能终止并跳出包含它的最近一层的循环体。

(3) 在嵌套循环的情况下,如果想让break语句跳出最外层的循环体。那么可通过设置一标志变量tag,然后在每层循环后面加上一条语句:if(tag)break;其值为1表示跳出循环体,为零则不跳出。

 

continue

(1)continue语句只能用于由while语句,do-while语句或for语句构成的循环结构中。

(2)在嵌套循环的情况下,continue语句只对包含它的最里层的循环体语句起作用。

posted on 2016-04-04 20:26  wcherry  阅读(204)  评论(0编辑  收藏  举报

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