机试题目中的文件操作

#include <fstream>

ofstream out("sf1.txt");

 ifstream in("sf1.txt");

#include<iostream>
#include<fstream>
#include<algorithm>
using namespace std;

struct Student
{
    char name[50];
    int age;
    int score;
}st[4];

bool cmp(Student a, Student b)
{
    return a.score < b.score;
}

int main()
{
    Student s;
    ofstream out("sf1.txt");
    cout << "请输入四名学生的姓名、年龄、成绩：" << endl;
    for (int i = 0; i < 4; i++)
    {
        cin >> s.name >> s.age >> s.score;
        out << s.name << "  " << s.age << "  " << s.score << endl;
    }
    ifstream in("sf1.txt");
    cout << "name  " << "  age  " << "score  " << endl;
    for (int i = 0; i < 4; i++)
    {
        in >> st[i].name >> st[i].age >> st[i].score;
        cout << st[i].name << "  " << st[i].age << "  " << st[i].score << endl;
    }
    sort(st, st + 4, cmp);
    cout << "name  " << "  age  " << "score  " << endl;
    for (int i = 0; i < 4; i++)
        cout << st[i].name << "  " << st[i].age << "  " << st[i].score << endl;
    return 0;
}