一些字符串处理函数的实现！

来源：互联网发布：win7系统网络共享设置编辑：程序博客网时间：2024/05/22 03:17

最近刚学完数组，把一些学了的字符串处理函数进行自己理解，写出了他们的一些转化程序。有出错的地方请大家指出，相互学习！

1、strcat字符串追加

size_t strcat(char * _Str1, const char * _Str2);

将参数_Str2追加到_Str1后尾

strcat字符串追加的实现：

#include <stdio.h>#include <string.h>//strcat字符串追加的实现int main(){char str1[100] = "hello ";char str2[] = "world";int len = strlen(str1);char *p1 = str1;char *p2 = str2;p1 = p1 + len;while (*p2){*(p1++) = *(p2++);}*p1 = '\0';puts(str1);return 0;}

2、strncat字符串有限追加

size_t strncat(char * _Str1, const char * _Str2, size_t len);

strncat字符串有限追加的实现：

#include <stdio.h>#include <string.h>int main(){char str1[100] = "hello ";char str2[] = "world";int len = strlen(str1);char *p1 = str1;char *p2 = str2;p1 = p1 + len;int n;scanf ("%d", &n);while (n){*(p1++) = *(p2++);n--;}*p1 = '\0';puts(str1);return 0;}

3、strcmp字符串比较

int strcmp(const char * _Str1,const char * _Str2);

比较两个字符串是否相等，相等返回0，不等返回非0

strcmp字符串比较的实现：

int main(){char str1[] = "workasjdksahdksahd";char str2[] = "world";char *p1 = str1;char *p2 = str2;while (*p1){if(*p1 == *p2){p1 = p1++;p2 = p2++;continue;}else{printf ("str1 != str2\n");break;}printf ("str1 == str2\n");}return 0;}

4、strncmp字符串有限比较的实现：

int main(){char str1[] = "workasjdksahdksahd";char str2[] = "world";char *p1 = str1;char *p2 = str2;int n;scanf ("%d", &n);while (n){if(*p1 == *p2){p1 = p1++;p2 = p2++;n--;if(n == 0){printf ("str1 == str2\n");}continue;}else{printf ("str1 != str2\n");break;}}return 0;}

5、strcop 字符串的拷贝的实现：

int main(){char str1[100] = "hello";char str2[] = "worldkgffijhgkjhgkjh";// 拷贝实现char *p1 = str1;char *p2 = str2;while (*p2){*(p1++) = *(p2++);}*p1 = '\0';puts(str1);return 0;}

6、strcop 字符串的有限拷贝的实现：

int main(){char str1[100] = "hello";char str2[] = "worldkgffijhgkjhgkjh";// 拷贝实现char *p1 = str1;char *p2 = str2;int n;scanf("%d", &n);while (n){*(p1++) = *(p2++);n--;}puts(str1);return 0;}

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