String compare

/* strcmp: return <0 if s<t, 0 if s==t, >0 if s>t */
int strcmp(char *s, char *t){
    int i;

    for (i = 0; s[i] == t[i]; i++)
         if (s[i] == '\0')
              return 0;
    return s[i] - t[i];
}
/*strcmp,pointer version: return < 0 if s<t, 0 if s == t, >0 if s>t */
int strcmp(char *s, char *t){
    for (: *s == *t; s++, t++)
         if (*s == '\0')
              return 0;
    return *s - *t;
}