如果想用while,这里我参考了7楼的.基本思路和上面的一样,如果有更好的!!希望能得到分享!
int match(char s[],char s1[])
{
    int i=0,j=0,k,m,t;
    m=strlen(s);
    j=strlen(s1);
    if(m<j)
    {
        return -1;
    }
    else
    {
        while(i<=m-j)
        {
            k=0,t=i;
            while((s[t]==s1[k])&&(t<=m))
            {
                k++;
                t++;
            }
            if(k==j)
            {
                return 1;
            }
        
               i++;
         }
        return 0;
     }  
}

#include <stdio.h>
#include <string.h>
#define MAX 255

int contain(char *str1, char *str2)
{
    if (strstr(str1, str2))
        return 1;
    return 0;
}

int main(void)
{
       char str1[MAX], str2[MAX];
   
        puts("input str1:");
        scanf("%s", str1);
        puts("input str2");
        scanf("%s", str2);
        
        if (contain(str1, str2))
            printf("str1 contain str2.");
        else
            printf("str1 not contain str2");

        return 0;   
}