C++輸入、寫入、顯示學生數據到文件中

#include<iostream>
#include<string>
#include<fstream>
using namespace std;
struct Student
{
    int num;
    string name;
    double score;
};
int main()
{
    int i;
    Student stu[3];
    fstream f("student.dat",ios::out);
    f.close();
    f.open("student.dat",ios::in);
    if(f.fail())
    {
        cout << "can not open" <<endl;
    }
    for(i=0;i<3;i++)
    {
        cout << "please enter the No." <<i+1<<" number"<<endl;
        cin>>stu[i].num;
        cout << "please enter the No." <<i+1<<" name"<<endl;
        cin>>stu[i].name;
        cout << "please enter the No." <<i+1<<" score"<<endl;
        cin>>stu[i].score;
        f.write((char*)&stu[i],sizeof(Student));
    }
    for(i=0;i<3;i++)
    {
        f.read((char *)&stu[i],sizeof(Student));
        cout<<"NUMBER："<<stu[i].num<<endl;
        cout<<"NAME："<<stu[i].name<<endl;
        cout<<"SCORE："<<stu[i].score<<endl;
    }
    f.close();
    return 0;
}