#include<iostream>
#include<string>
#include<fstream>
using namespace std;
ifstream infile;
ofstream outfile;
outfile.open("student.dat");
int main()
{
    cout<<"please input grades in order."<<endl;
    int i,j;
    int b[3][7];
    for(i=0;i<7;i++)
    {
        cout<<"please input the "<<i+1<<"student's grades.(english,math,physic)"<<endl;
        for(j=0;j<3;j++)
        {
            cin>>b[j];
            if(b[j]>100||b[j]<0)
            cout<<"it's error grade.please input again."<<endl;
            outfile>>b[j];
        }
        cout<<endl;
    }
    return 0;
}
[u]为什么会返回错的状态码？求助！！