5、重载>>,<<符号，实现学生信息的输入输出。

好的，可以的。为了方便起见，我先定义一个学生类的模板，你可以根据自己的需求进行修改：

#include <iostream>
#include <string>
using namespace std;

class Student {
public:
    string name;
    int age;
    string gender;
    string major;
    double gpa;

    friend ostream& operator<<(ostream& os, const Student& stu);
    friend istream& operator>>(istream& is, Student& stu);
};

ostream& operator<<(ostream& os, const Student& stu) {
    os << "Name: " << stu.name << endl;
    os << "Age: " << stu.age << endl;
    os << "Gender: " << stu.gender << endl;
    os << "Major: " << stu.major << endl;
    os << "GPA: " << stu.gpa << endl;
    return os;
}

istream& operator>>(istream& is, Student& stu) {
    cout << "Please enter student's name: ";
    getline(is, stu.name);
    cout << "Please enter student's age: ";
    is >> stu.age;
    cout << "Please enter student's gender: ";
    is >> stu.gender;
    cout << "Please enter student's major: ";
    is >> stu.major;
    cout << "Please enter student's GPA: ";
    is >> stu.gpa;
    return is;
}

然后，你可以在主函数中调用这两个重载符号进行输入输出。

int main() {
    Student stu;
    cin >> stu;
    cout << stu;
    return 0;
}

这样，当你运行程序时，就可以输入学生的信息并输出了。