C++继承与派生习题_c++继承与派生练习题

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

class teacher
{
protected:
    int sum;
    string name;
    char sex;
public:
    void input_A()
    {
        cout<<"Please input the teacher's sum,name and sex:";
        cin>>sum;
        cin>>name;
        cin>>sex;
    }
    void output_A()
    {
        cout<<"sum:"<<sum<<"name:"<<name<<"sex:"<<sex<<endl;
    }
};
class birthday
{
public:
    int year,month,day;
        void input_B()
        {
            cout<<"Please input the teacher's birthday:(year,month,day):";
            cin>>year;