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.

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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;
}