利用指標實現strncmp函式功能

利用指標實現strncmp函式功能

#include<stdio.h>
#include<string.h>

int mstrncmp( char *s1,  char *s2, size_t n)
{
    while(*s1 && *s2 && (*s1 = *s2) && (n--))
    {
        s1++;
        s2++;
    }
#if 1
    if((*s1 - *s2) > 0)
        return 1;
    else if((*s1 - *s2) < 0)
        return -1;
    else 
        return 0;
#else   
    return *s1 - *s2;
#endif
}

int main(int argc, const char *argv[])
{
    char str1[] = {"sjkab"};
    char str2[] = {"ajbhfjkabh"};
    printf("mstrcmp: %d\n", mstrncmp(str1, str2, 0));
    printf("strcmp: %d\n", strncmp(str1, str2, 0));
    return 0;
}```