文件输入输出代码

#include<iomanip>
#include<fstream>
#include<iostream>
#include<string>
using namespace std;
int main()
{
    struct Student
    {
    char name[10];
    long id;
    char major[10];
    float score;
    float score1;
    };

    Student a,b,c;
    Student d,e,f;

    ofstream outstr("E:\a.txt",ios::out);
    ifstream instr;
if(!outstr)
    {
    cout<<"Error!"<<endl;
return -1;
    }
cout<<"请输入学生姓名，学号，专业，成绩，成绩："<<endl;

cin>>a.name>>a.id>>a.major>>a.score>>a.score1;
cin>>b.name>>b.id>>b.major>>b.score>>b.score1;
cin>>c.name>>c.id>>c.major>>c.score>>c.score1;

outstr<<setw(6)<<a.name<<setw(6)<<a.id<<setw(6)<<a.major<<setw(6)<<a.score<<setw(6)<<a.score1<<endl;
outstr<<setw(6)<<b.name<<setw(6)<<b.id<<setw(6)<<b.major<<setw(6)<<b.score<<setw(6)<<b.score1<<endl;
outstr<<setw(6)<<c.name<<setw(6)<<c.id<<setw(6)<<c.major<<setw(6)<<c.score<<setw(6)<<c.score1<<endl;

outstr.close();

instr.open("E:\a.txt");

instr>>d.name>>d.id>>d.major>>d.score>>d.score1;
instr>>e.name>>e.id>>e.major>>e.score>>e.score1;
instr>>f.name>>f.id>>f.major>>f.score>>f.score1;

cout<<d.name<<d.id<<d.major<<d.score<<d.score1<<endl;
cout<<e.name<<e.id<<e.major<<e.score<<e.score1<<endl;
cout<<f.name<<f.id<<f.major<<f.score<<f.score1<<endl;

instr.close();
system("pause");
return 0;
}