C语言字符篇（三）字符串比较函数

#include <string.h>
int strcmp(const char *s1, const char *s2);	比较字符串s1和s2
int strncmp(const char *s1, const char *s2, size_t n);	比较字符串s1和s2前n个字符

 

如果两个字符一样大,返回值为 0

如果s1>s2,则返回正值,

如果s1<s2,则返回负值.

 

-------------------------------------------------------
int main(int argc, char **argv) { const char *s1="hello"; const char *s2="hello"; const char *s3="aello"; int ret1,ret2; ret1=strncmp(s1,s2,strlen(s1)); ret2=strncmp(s1,s3,strlen(s1)); printf("%d\n",ret1);    //0
    printf("%d\n",ret2);    //7
 　　return 0; }