10.13 作业

/*  封装一个学生的类, 定义一个学生类的vector容器, 里面存放学生对象(至少3个)
    再把该容器中的对象保存到文件中
    再把这些学生从文件中读取出来, 放入另一个容器中并且遍历输出该容器里的学生 */
#include 
#include 
#include 

using namespace std;

class Student
{
    friend ifstream &operator>>(ifstream &ifs, Student &stu);
    friend ofstream &operator<<(ofstream &ofs, const Student &stu);
    friend ostream &operator<<(ostream &cout, const Student &stu);

private:
    string name;
    int age;

public:
    Student() {}
    Student(string n, int a) : name(n), age(a) {}
};

ofstream &operator<<(ofstream &ofs, const Student &stu)
{
    ofs << "姓名: " << stu.name << " 年龄: " << stu.age << endl;
    return ofs;
}

ostream &operator<<(ostream &cout, const Student &stu)
{
    cout << "姓名: " << stu.name << " 年龄: " << stu.age << endl;
    return cout;
}

ifstream &operator>>(ifstream &ifs, Student &stu)
{
    char buf[50];
    ifs >> buf >> stu.name >> buf >> stu.age;
    return ifs;
}

int main()
{
    vector v;
    v.push_back(Student("张三", 18));
    v.push_back(Student("李四", 17));
    v.push_back(Student("王五", 20));

    ofstream ofs;                                   // 创建写类流对象
    ofs.open("D:/HQYJ/C++_code/stu.txt", ios::out); // 打开文件
    vector::iterator i;                    // 迭代器
    for (i = v.begin(); i != v.end(); i++)          // 写入数据
    {
        ofs << *i;
    }
    ofs.close(); // 关闭文件

    ifstream ifs;                                  // 创建读类流对象
    ifs.open("D:/HQYJ/C++_code/stu.txt", ios::in); // 打开文件
    vector vv;
    Student stu;
    while (ifs >> stu)
    {
        vv.push_back(stu);
    }
    ifs.close(); // 关闭文件

    for (i = vv.begin(); i != vv.end(); i++)
    {
        cout << *i;
    }

    return 0;
}

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