Some task

#include <iostream>

using namespace std;

class student {
private:
    string name;
    int course;
    bool gender;

public:
    student() {}

    student(string _name, int _course, bool _gender) : name(_name), course(_course), gender(_gender) {}

    student(const student& a) {

        name = a.name;
        course = a.course;
        gender = a.gender;
    }

    student& operator = (const student& a) {

        name = a.name;
        course = a.course;
        gender = a.gender;

        return *this; // ?????????? ?????? ?? ?????????? ??????
    }

    void input() {
        string s_gender;

        cout << "Enter name of the student: ";
        cin >> name;
        cout << "Enter course of the student: ";
        cin >> course;
        cout << "Enter gender of the student (male or female): ";
        cin >> s_gender;

        if (s_gender == "male") {
            gender = false;
        } else if (s_gender == "female") {
            gender = true;
        } else {
            cout << "error";

            exit(1);
        }
    }

    void output() {

        cout << "Name of the student is: " << name << endl;
        cout << "Student's course is: " << course << endl;
        cout << "Gender is: ";

        if (gender) {
            cout << "female";
        } else {
            cout << "male";
        }

        cout << endl << endl;
    }
};

int main() {

    student student_1("Mariia", 2, "female");

    student_1.output();

    student student_2 = student_1;

    student_2.output();

    student student_3;

    student_3 = student_2 = student_1;

    student_3.output();

    return 0;
}