[C/C++] memcmp(char*, char*, len) 函数的用法

#include <iostream>#include <vector>#include <cstdio>#include <string.h>int main() {    char *s1 = "Hello123uio!";    char *s2 = "Hello123uio!";    int r;    r = memcmp(s1, s2, strlen(s1));    if(!r)        printf("s1 and s2 are identical");    else {        if(r<0)            printf("s1 less than s2");        else            printf("s1 greater than s2");    }    return 0;}