什么意思。。

看样子是a[i]==b[i]=='\0'这句错了吧？

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

int cmp(char *,char *);

int main(void)
{
    int c;
    char a[10],b[10];
    printf("Please enter your string.\n");
    gets(a);
    gets(b);
    puts("The string you entered is:");
    puts(a);
    puts(b);
    c=cmp(a,b);
    if(c==1)
        printf("the string \"%s\" is bigger than the string \"%s\".",a,b);
    else
        printf("the string \"%s\" is bigger than the string \"%s\".",b,a);

    printf("%d",c);
    return 0;




}

int cmp(char *ptr1,char *ptr2)
{
    int flag;

    if(strlen(ptr1)!=strlen(ptr2))
    {
        flag=(strlen(ptr1)>strlen(ptr2))?1:-1;
        return flag;

    }
    else
    {
        while((*ptr1!='\0') && (*ptr2!='\0'))
        {
            if(*ptr1>*ptr2)
            {
                flag=1;
                return flag;
            }
            else if(*ptr1<*ptr2)
            {
                flag=-1;
                return flag;
               
            }
            else
            {
                ptr1++;
                ptr2++;

            }

        }
        return -1;

    }

   
}
我写的一个，大家有空批一下啊

用到了strlen这个库函数  嘿嘿  不用库函数试试