第十题

#include <iostream>
#include <cstring>
using namespace std;
class Teacher                              
 {public:
  Teacher(int,char [],char);           
    void display();                         
  private:
   int num;
   char name[20];
   char sex;
  };

Teacher::Teacher(int n,char nam[],char s)   
 {num=n;
  strcpy(name,nam);
  sex=s;
}

void Teacher::display()                     
 {cout<<"num:"<<num<<endl;
  cout<<"name:"<<name<<endl;
  cout<<"sex:"<<sex<<endl;
}

class BirthDate                               
 {public:
    BirthDate(int,int,int);                  
    void display();                         
    void change(int,int,int);                
  private:
    int year;
    int month;
    int day;
};

BirthDate::BirthDate(int y,int m,int d)       
 {year=y;
  month=m;
  day=d;
 }

void BirthDate::display()                    
 {cout<<"birthday:"<<month<<"/"<<day<<"/"<<year<<endl;}

void BirthDate::change(int y,int m,int d)    
 {year=y;
  month=m;
  day=d;
 }

class Professor:public Teacher                        
 {public:
    Professor(int,char [],char,int,int,int,float);   
    void display();                                  
    void change(int,int,int);                         
   private:
    float area;
    BirthDate birthday;                              
 };

Professor::Professor(int n,char nam[20],char s,int y,int m,int d,float a):
 Teacher(n,nam,s),birthday(y,m,d),area(a){ }         

void Professor::display()                             
{Teacher::display();
 birthday.display();
 cout<<"area:"<<area<<endl;
}

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

int main()
{Professor prof1(3055,"li",'m',1933,05,01,150.9);   
 cout<<endl<<"original data:"<<endl;
 prof1.display();                                     
 cout<<endl<<"new data:"<<endl;
 prof1.change(1950,6,1);                             
 prof1.display();                                    
 return 0;
}

<img src="https://img-blog.csdn.net/20150518225428954?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbW9sdXpodWk=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />