acm~~继承和组合

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/*烟台大学计算机学院学生 
*All right reserved. 
*文件名称:acm~~继承和组合
*作者：杨飞 
*完成日期：2014年5月20日 
*版本号：v1.0 
*对任务及求解方法的描述部分:acm~~继承和组合
*我的程序：*/  

#include <iostream>
#include <string>
using namespace std;
class BirthDate {
public:
    BirthDate(int,int,int);
    void display();
    void setbirthday(int,int,int);
private:
    int year;
    int month;
    int day;
};
class Teacher
{
public:
    Teacher(int,string,char);
    void display();
private:
    int num;
    string name;
    char sex;
};
class Professor:public Teacher
{
public:
    Professor(int,string,char,BirthDate);
    void display();
    void setbirthday(int,int,int);
private:
    BirthDate birthday;
};

int main()
{
  int num;
  string name;
  char sex;
int year,month,day;
cin>>num>>name>>sex;
cin>>year>>month>>day;
Professor prof(num,name,sex,BirthDate(year,month,day));
cin>>year>>month>>day;
prof.setbirthday(year,month,day);
prof.display();
    return 0;

}
BirthDate::BirthDate(int y,int m,int d)
{
    year=y;
    month=m;
    day=d;
}
void BirthDate::display()
{
    cout<<"birthday:"<<year<<"/"<<month<<"/"<<day<<endl;
}
void BirthDate::setbirthday(int y,int m,int d)
{

    year=y;
    month=m;
    day=d;
}
Teacher::Teacher(int n,string n1,char n2)
{
    num=n;
    name=n1;
    sex=n2;
}
void Teacher::display()
{
    cout<<"num:"<<num<<endl;
    cout<<"name:"<<name<<endl;
    cout<<"sex:"<<sex<<endl;
}
Professor::Professor(int n,string n1,char n2,BirthDate m):Teacher(n,n1,n2),birthday(m){}
void Professor::display()
{
   Teacher::display();
   birthday.display();
}

void Professor::setbirthday(int y,int m,int d)
{
     birthday.setbirthday(y,m,d);
}