#include<stdio.h>
#include<string.h>
int compare(char *p1, char *p2)
{
    int i = 0, j = 0;
    int m, n, p, c;
    m = strlen(p1);
    n = strlen(p2);
    while ((m >= n ? p1[i] : p2[i]) != '\0')
    {
        if (p1[i] == p2[j])
            p = 1;
        else
        {
            c = p1[i] - p2[j];
            p = 0;
            break;
        }
        i++;
        j++;
    }
    if (p == 1)
        return 0;
    else
        return c;
}

void input(char *p1, char *p2)
{
    printf("input string 1:\n");
    gets_s(p1, 80);
    printf("input string 2:\n");
    gets_s(p2, 80);
}

void print(int c)
{
    printf("%d\n", c);
}

int main()
{
    void input(char *p1, char *p2);
    int compare(char *p1, char *p2);
    void print(int c);
    int c;
    char a[80], b[80];
    char *p1, *p2;
    p1 = a;
    p2 = b;
    input(p1, p2);
    c = compare(p1, p2);
    print(c);
    return 0;
}

慢慢来~

这样可否？
int compare(char *p1, char *p2)
{
    for (; *p1 && *p2 && *p1==*p2; p1++,p2++) NULL;
    return *p1-*p2;
}

收到的鲜花

• 炎天 于 2017-01-29 12:43 送鲜花  3朵   附言：好文章