新手求助！！！

#include <iostream>
using namespace std;

int main(void)
{
    int score[6][3];//二位数组 存放6人3门功课的成绩及平均成绩
    int n=0;
    //收集成绩
    for (int i=0; i<6; i++)
    {
        cout<<"请输入第 "<<i+1<<" 位同学3门功课的成绩:"<<endl;
        for (int j=0; j<3; j++)
        {
            cout<<"请输入第"<<j+1<<" 门成绩: ";
            cin>>score[i][j];
        }
    }

    //输出成绩
    cout<<"请输入要查询成绩的同学序号(1-6),输入 0 结束查询";
    cin>>n;
    while (n)
    {
        n--;
        cout<<"序号为 "<<n<<" 的同学成绩如下:"<<endl;    //输出单科成绩
        for (int i=0; i<3; i++)
        {
            cout<<"第 "<<i+1<<" 门成绩:";
            cout<<score[n][i]<<endl;
            if (i == 2)                                    //输出平均成绩
            {
                cout<<"平均成绩：";
                cout<<(score[n][0]+score[n][1]+score[n][2])/3<<endl;
            }
        }

        cout<<"请输入要查询成绩的同学序号(1-6),输入 0 结束查询";
        cin>>n;

    }

    return 0;
}