代码

//比较字符串
#include<stdio.h>
#include<string.h>

int myCompare(const char* s1, const char* s2);

int main()
{
    char s1[10];
    char s2[10];
    printf("input s1:");
    scanf("%s",&s1);
    printf("input s2:");
    scanf("%s",&s2);
    
    printf("%d",myCompare(s1,s2));
    
    return 0;
 } 
 
 int myCompare(const char* s1, const char* s2)
 {
    while(*s1==*s2 && *s1 != '\0')
    {
        s1++;
        s2++;
     }
    return *s1 - *s2;
 }

输出

output.PNG