已有类 Time和Date，要求设计一个派生类Birthtime，它是Time和Date的公有派生类，新增一个数据成员childName用于表示小孩的名字，设计主程序显示一个小孩的名字和出生日期时间。数据通过键盘输入，需要判断输入的年月日时分秒是否有效。c++语言

以下是实现Birthtime类的代码：

#include <iostream>
using namespace std;

class Time {
protected:
    int hour, minute, second;
public:
    Time(int hh = 0, int mm = 0, int ss = 0) {
        hour = hh;
        minute = mm;
        second = ss;
    }

    void setTime(int hh, int mm, int ss) {
        hour = hh;
        minute = mm;
        second = ss;
    }

    void printTime() {
        cout << hour << ":" << minute << ":" << second << endl;
    }
};

class Date {
protected:
    int year, month, day;
public:
    Date(int yy = 0, int mm = 0, int dd = 0) {
        year = yy;
        month = mm;
        day = dd;
    }

    void setDate(int yy, int mm, int dd) {
        year = yy;
        month = mm;
        day = dd;
    }

    void printDate() {
        cout << year << "-" << month << "-" << day << endl;
    }
};

class Birthtime : public Time, public Date {
private:
    string childName;
public:
    Birthtime(int yy = 0, int mm = 0, int dd = 0, int hh = 0, int mi = 0, int ss = 0, string name = "") : Time(hh, mi, ss), Date(yy, mm, dd) {
        childName = name;
    }

    void setBirthtime(int yy, int mm, int dd, int hh, int mi, int ss, string name) {
        Date::setDate(yy, mm, dd);
        Time::setTime(hh, mi, ss);
        childName = name;
    }

    void printBirthtime() {
        cout << "Child Name: " << childName << endl;
        cout << "Birth Date: ";
        Date::printDate();
        cout << "Birth Time: ";
        Time::printTime();
    }
};

int main() {
    int year, month, day, hour, minute, second;
    string name;

    cout << "Enter the child's name: ";
    getline(cin, name);

    cout << "Enter the birth date (yyyy-mm-dd): ";
    scanf("%d-%d-%d", &year, &month, &day);

    cout << "Enter the birth time (hh:mm:ss): ";
    scanf("%d:%d:%d", &hour, &minute, &second);

    Birthtime birthtime;

    if (year >= 0 && month >= 1 && month <= 12 && day >= 1 && day <= 31 && hour >= 0 && hour <= 23 && minute >= 0 && minute <= 59 && second >= 0 && second <= 59) {
        birthtime.setBirthtime(year, month, day, hour, minute, second, name);
        birthtime.printBirthtime();
    } else {
        cout << "Invalid input!" << endl;
    }

    return 0;
}

以上代码实现了一个名为Birthtime的派生类，它继承了Time和Date两个基类，并新增了一个数据成员childName表示小孩的名字。在主程序中，用户输入小孩的名字、出生日期和出生时间，如果输入有效，则将这些数据传递给Birthtime对象并打印出来；否则，提示用户输入无效。