已有类Time和Date，要求设计一个 派生类Birthtime，它继承类Time和Date，并且增加一个数据成员Child name用于表示小孩的名字，同时设计主程序显示一个小孩的出生时间和名字。运用构造函数

下面是代码实现：

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

class Time {
protected:
    int hour, minute, second;
public:
    Time(int h, int m, int s) {
        hour = h;
        minute = m;
        second = s;
    }
    void display() {
        cout << hour << ":" << minute << ":" << second << endl;
    }
};

class Date {
protected:
    int year, month, day;
public:
    Date(int y, int m, int d) {
        year = y;
        month = m;
        day = d;
    }
    void display() {
        cout << year << "-" << month << "-" << day << endl;
    }
};

class Birthtime : public Time, public Date {
private:
    string childName;
public:
    Birthtime(string name, int y, int m, int d, int h, int mi, int s) : Time(h, mi, s), Date(y, m, d) {
        childName = name;
    }
    void display() {
        cout << "Child Name: " << childName << endl;
        cout << "Birth Time: ";
        Date::display();
        cout << "           ";
        Time::display();
    }
};

int main() {
    Birthtime b("Tom", 2021, 8, 16, 8, 30, 0);
    b.display();
    return 0;
}

输出结果为：

Child Name: Tom
Birth Time: 2021-8-16
           8:30:0