C++创建学生类练习

/*作业,定义一个学生类*/
/*数据成员：学号、姓名、数学、英语、计算机三科成绩
*成员函数：求总成绩、求三科平均成绩、输出学生信息
*新增一个生日类  2018.4.2
*/

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

class Data
{
public:
    Data();
    Data(int ye, int mon, int da);
    Data(Data &da);
    void inf();
private:
    int year;
    int month;
    int day;
};

class Student {//define a class called "Student"
public:
    Student(int num, string na, int ma, int en, int cs, Data tp);    //constructors
    Student(Student &stu);                                  //Copy constructors
    ~Student();
    int sum();//the sum grade
    int ave();//calculate the average grade
    void show();//show the details of the student
private:
    Data birthday;
    int number;
    string name;
    int math;
    int eng;
    int com;
};
Data::Data()
{
    year = 1998;
    month = 8;
    day = 3;
}
Data::Data(int ye = 0, int mon = 0, int da = 0)
{
    year = ye;
    month = mon;
    day = da;
}
Data::Data(Data &da)
{
    cout << endl << "Warnning:This Copy constructors.!!!" << endl;
    year = da.year;
    month = da.month;
    day = da.day;
}
void Data::inf()
{
    cout << "Birthday:" << year << "/" << month << "/" << day << endl;
}
//the realization of class
Student::Student(int num, string na, int ma, int en, int cs, Data tp) :birthday(tp) {
    number = num;
    name = na;
    math = ma;
    eng = en;
    com = cs;
}
Student::~Student()
{

}
Student::Student(Student &stu) :birthday(stu.birthday) {
    cout << endl << "Warnning:This Copy constructors.!!!" << endl;
    number = stu.number;
    name = stu.name;
    math = stu.math;
    eng = stu.eng;
    com = stu.com;
}
int Student::sum() {
    return math + eng + com;
}
int Student::ave() {
    return (math + eng + com) / 3;
}
void Student::show() {
    cout << "Number:" << number << endl;
    cout << "Name:" << name << endl;
    birthday.inf();
    cout << "Math score:" << math << endl;
    cout << "English score:" << eng << endl;
    cout << "Computer score:" << com << endl;
    cout << "Sum score:" << sum() << endl;
    cout << "Average score:" << ave() << endl;
}
//the main
int main() {
    Data tmp(2012, 12, 02);
    Student noob(001, "!#%$#^$%^", 90, 89, 88, tmp);//Initialization
                                                    //output
    noob.show();
    Student newbie(noob);   //Copy constructors
    newbie.show();
    return 0;
}

• 测试结果