作业5

task1_1
`#include <stdio.h>

define N 5

void input(int x[], int n);
void output(int x[], int n);
void find_min_max(int x[], int n, int *pmin, int *pmax);

int main() {
int a[N];
int min, max;

printf("录入%d个数据:\n", N);
input(a, N);

printf("数据是: \n");
output(a, N);

printf("数据处理...\n");
find_min_max(a, N, &min, &max);

printf("输出结果:\n");
printf("min = %d, max = %d\n", min, max);

return 0;

}

void input(int x[], int n) {
int i;

for(i = 0; i < n; ++i)
    scanf("%d", &x[i]);

}

void output(int x[], int n) {
int i;

for(i = 0; i < n; ++i)
    printf("%d ", x[i]);
printf("\n");

}

void find_min_max(int x[], int n, int *pmin, int *pmax) {
int i;

*pmin = *pmax = x[0];

for(i = 1; i < n; ++i)
    if(x[i] < *pmin)
        *pmin = x[i];
    else if(x[i] > *pmax)
        *pmax = x[i];

}`

task1_2
`#include <stdio.h>

define N 5

void input(int x[], int n);
void output(int x[], int n);
int *find_max(int x[], int n);

int main() {
int a[N];
int *pmax;

printf("录入%d个数据:\n", N);
input(a, N);

printf("数据是: \n");
output(a, N);

printf("数据处理...\n");
pmax = find_max(a, N);

printf("输出结果:\n");
printf("max = %d\n", *pmax);

return 0;

}

void input(int x[], int n) {
int i;

for(i = 0; i < n; ++i)
    scanf("%d", &x[i]);

}

void output(int x[], int n) {
int i;

for(i = 0; i < n; ++i)
    printf("%d ", x[i]);
printf("\n");

}

int *find_max(int x[], int n) {
int max_index = 0;
int i;

for(i = 1; i < n; ++i)
    if(x[i] > x[max_index])
        max_index = i;

return &x[max_index];

}`

task2_1
`#include <stdio.h>

include <string.h>

define N 80

int main() {
char s1[] = "Learning makes me happy";
char s2[] = "Learning makes me sleepy";
char tmp[N];

printf("sizeof(s1) vs. strlen(s1): \n");
printf("sizeof(s1) = %d\n", sizeof(s1));
printf("strlen(s1) = %d\n", strlen(s1));

printf("\nbefore swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

printf("\nswapping...\n");
strcpy(tmp, s1);
strcpy(s1, s2);
strcpy(s2, tmp);

printf("\nafter swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

return 0;

}`

task2_2
`#include <stdio.h>

include <string.h>

define N 80

int main() {
char *s1 = "Learning makes me happy";
char *s2 = "Learning makes me sleepy";
char *tmp;

printf("sizeof(s1) vs. strlen(s1): \n");
printf("sizeof(s1) = %d\n", sizeof(s1));
printf("strlen(s1) = %d\n", strlen(s1));

printf("\nbefore swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

printf("\nswapping...\n");
tmp = s1;
s1 = s2;
s2 = tmp;

printf("\nafter swap: \n");
printf("s1: %s\n", s1);
printf("s2: %s\n", s2);

return 0;

}`

task3
`#include <stdio.h>

include <stdio.h>

int main() {
int x[2][4] = {{1, 9, 8, 4}, {2, 0, 4, 9}};
int i, j;
int ptr1; // 指针变量,存放int类型数据的地址
int(
ptr2)[4]; // 指针变量,指向包含4个int元素的一维数组

printf("输出1: 使用数组名、下标直接访问二维数组元素\n");
for (i = 0; i < 2; ++i) {
    for (j = 0; j < 4; ++j)
        printf("%d ", x[i][j]);
    printf("\n");
}

printf("\n输出2: 使用指向元素的指针变量ptr1间接访问二维数组元素\n");
for (ptr1 = &x[0][0], i = 0; ptr1 < &x[0][0] + 8; ++ptr1, ++i) {
    printf("%d ", *ptr1);

    if ((i + 1) % 4 == 0)
        printf("\n");
}
                     
printf("\n输出3: 使用指向一维数组的指针变量ptr2间接访问二维数组元素\n");
for (ptr2 = x; ptr2 < x + 2; ++ptr2) {
    for (j = 0; j < 4; ++j)
        printf("%d ", *(*ptr2 + j));
    printf("\n");
}

return 0;

}`

task4_1
`#include <stdio.h>

define N 80

void replace(char *str, char old_char, char new_char); // 函数声明

int main() {
char text[N] = "c programming is difficult or not, it is a question.";

printf("原始文本: \n");
printf("%s\n", text);

replace(text, 'i', '*'); // 函数调用 注意字符形参写法,单引号不能少

printf("处理后文本: \n");
printf("%s\n", text);

return 0;

}

// 函数定义
void replace(char *str, char old_char, char new_char) {
int i;

while(*str) {
    if(*str == old_char)
        *str = new_char;
    str++;
}

}`

task4_2
`#include <stdio.h>

define N 80

void str_trunc(char *str, char x);

int main() {
char str[N];
char ch;

printf("输入字符串: ");
gets(str);

printf("输入一个字符: ");
ch = getchar();

printf("截断处理...\n");
str_trunc(str, ch);

printf("截断处理后的字符串: %s\n", str);

}
void str_trunc(char str, char x) {
while(
str) {
if(*str == x)
*str='\0';// blank1

    str++;// blank2
}

str--;// blank3

}`

task5_1
`#include <stdio.h>

include <string.h>

void sort(char *name[], int n);

int main() {
char *course[4] = {"C Program",
"C++ Object Oriented Program",
"Operating System",
"Data Structure and Algorithms"};
int i;

sort(course, 4);

for (i = 0; i < 4; i++)
    printf("%s\n", course[i]);

return 0;

}

void sort(char *name[], int n) {
int i, j;
char *tmp;

for (i = 0; i < n - 1; ++i)
    for (j = 0; j < n - 1 - i; ++j)
        if (strcmp(name[j], name[j + 1]) > 0) {
            tmp = name[j];
            name[j] = name[j + 1];
            name[j + 1] = tmp;
        }

}`

task5_2
`#include <stdio.h>

include <string.h>

void sort(char *name[], int n);

int main() {
char *course[4] = {"C Program",
"C++ Object Oriented Program",
"Operating System",
"Data Structure and Algorithms"};
int i;

sort(course, 4);
for (i = 0; i < 4; i++)
    printf("%s\n", course[i]);

return 0;

}

void sort(char *name[], int n) {
int i, j, k;
char *tmp;

for (i = 0; i < n - 1; i++) {
    k = i;
    for (j = i + 1; j < n; j++)
        if (strcmp(name[j], name[k]) < 0)
            k = j;

    if (k != i) {
        tmp = name[i];
        name[i] = name[k];
        name[k] = tmp;
    }
}

}`

task6
`#include <stdio.h>

include <string.h>

define N 5

int check_id(char *str); // 函数声明

int main() {
char *pid[N] = {"31010120000721656X",
"330106199609203301",
"53010220051126571",
"510104199211197977",
"53010220051126133Y"};
int i;

for (i = 0; i < N; ++i)
    if (check_id(pid[i])) // 函数调用
        printf("%s\tTrue\n", pid[i]);
    else
        printf("%s\tFalse\n", pid[i]);

return 0;

}

// 函数定义
// 功能: 检查指针str指向的身份证号码串形式上是否合法。
// 形式合法,返回1,否则,返回0
int check_id(char *str) {
int length=strlen(str);
if(length!=18)
return 0;
for (int i = 0; i < length; ++i) {
if (!(str[i]>='0'&&str[i]<='9') && !(str[i] == 'X' ))
return 0;
}
return 1;
}`

task7
`#include <stdio.h>

define N 80

void encoder(char *str); // 函数声明
void decoder(char *str); // 函数声明

int main() {
char words[N];

printf("输入英文文本: ");
gets(words);

printf("编码后的英文文本: ");
encoder(words); // 函数调用
printf("%s\n", words);

printf("对编码后的英文文本解码: ");
decoder(words); // 函数调用
printf("%s\n", words);

return 0;

}

/*函数定义
功能:对s指向的字符串进行编码处理
编码规则:
对于az或AZ之间的字母字符,用其后的字符替换; 其中,z用a替换,Z用A替换
其它非字母字符,保持不变
/
void encoder(char str) {
while (
str) {
if (
str >= 'a' && str <= 'z') {
str = (str - 'a' + 1) % 26 + 'a';
} else if (
str >= 'A' && *str <= 'Z') {
str = (str - 'A' + 1) % 26 + 'A';
}
str++;
}
}

/*函数定义
功能:对s指向的字符串进行解码处理
解码规则:
对于az或AZ之间的字母字符,用其前面的字符替换; 其中,a用z替换,A用Z替换
其它非字母字符,保持不变
/
void decoder(char str) {
while (
str) {
if (
str >= 'a' && str <= 'z') {
str = (str - 'a' - 1 + 26) % 26 + 'a';
} else if (
str >= 'A' && *str <= 'Z') {
str = (str - 'A' - 1 + 26) % 26 + 'A';
}
str++;
}
}`


posted @ 2024-05-26 22:18  _FuBuki  阅读(28)  评论(0)    收藏  举报