《从零开始的C语言生活》实现简易的strcmp函数功能

#include <stdio.h>
int MyStrcmp(char *p1,char *p2);
int MyStrcmp(char *p1,char *p2){

    for(;*p1==*p2;p1++,p2++){
        if(*p1=='\0'){
            return 0;
        }

    }
    return *p1-*p2;
}

int main()
{
    char a[]="Hello";
    char b[]="Helly";
    printf("diffrence %d\n",MyStrcmp(a,b));
char c[]="word";
char d[]="word";
printf("same result is: %d",MyStrcmp(c,d));

}

或是使用：

#include <stdio.h>
int MyStrcmp(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]);
}
int main()
{
    char a[]="Hello";
    char b[]="Helly";
    printf("diffrence %d\n",MyStrcmp(a,b));
char c[]="word";
char d[]="word";
printf("same result is: %d",MyStrcmp(c,d));

}