c语言pat基础题0826L1059

Question

我的代码出现问题，本题希望可以得到大家的指导，谢谢你的帮助！

Answer 1

供参考：

#include <stdio.h>
#include <string.h>
int main()
{
    char str[21][101];
    int  i, j, N, flg = 0, blk;
    scanf("%d",&N);
    getchar();
    for(i = 0;i < N; i++)
        gets(str[i]);
    for(i = 0;i < N; i++)
    {
        for(j = 0, flg = 0; str[i][j]; j++)
        {
            if(str[i][j] == ',' || str[i][j] == '.'){
                if(str[i][j-1] == 'g' && str[i][j-2] == 'n' && str[i][j-3] == 'o')
                    flg++;
            }
            if (flg == 2){
                for (blk = 0, j; blk < 3; j--)
                    if (str[i][j] == ' ') blk++;
                str[i][++j] = '\0';
                strcat(str[i], " qiao ben zhong.");
                break;
            }
        }
        if(flg == 2)
            printf("%s",str[i]);
        else
            printf("Skipped");
        if (i < N - 1) printf("\n");
    }
    return 0;
}