C语言实现strcmp

#include <stdio.h>

int MyStrcmp(const char *s1,const char *s2)

{

    while(*s1 != '\0'&&*s2 != '\0'&&*s1 == *s2)

    {

        s1++;

        s2++;

    }

    return *s1 < *s2 ?-1:(*s1==*s2 ?0:1);

}

int main(void)

{

    char s1[] = "abc";

    char s2[] = "cde";

    int res = MyStrcmp(s1,s2);

    if(res == -1)

    {

        puts("<");

    }

    else if(res == 0)

    {

        puts("==");

    }

    else

    {

        puts(">");

    }

}