#include<stdio.h>
#include<string.h>
int main()
{
    char str1[100], str2[100];
    int i,j,r,k;
    while(gets(str1) != NULL)
    {
        gets(str2);
        for(i=0; str1[i] != '\0'; i++)
        {
            j = 0;
            if(str1[i] != str2[j]){
                printf("%c", str1[i]);
                continue;
            }
            for(j=0; str2[j] != '\0'; j++)
            {
                if(str1[i+j] != str2[j]) break;
            }
            if(str2[j] == '\0')
            {
                i = i + j - 1;
                continue;
            }
            printf("%c", str1[i]);
        }
        puts("");
    }
    return 0;
}

没有提出问题？

问题在哪里?