#include<iostream>
using namespace std;
class CPolygon{
protected:
int width,height;
public:
void set_values(int a,int b)
{width=a;height=b;}
};
class CRectangle:public CPolygon{
public:
int area()
{return (width*height);}
};
class CTriangle:public CPolygon{
public:
int area()
{return(width*height/2);}
};
int main()
{
CRectangle rect;
CTriangle trgl;
rect.set_values (4,5);
trgl.set_values (4,5);
cout<<rect.area()<<endl;
cout<<trgl.area()<<endl;
return 0;
}
//DateTime.h
#pragma once
#include"date.h"
#include"time.h"
class dateTime:public date,public time{public:
dateTime(void);
dateTime(int y,int mon,int d,int h,int m,int s);
date(y,mon,d),time(h,m,s){}
~dateTime(void)
void displayDateAndTime();};
/main.cpp
#include<iostream>
using namespace std;
class mother{
public:
mother()
{cout<<"mother\n";}
};
class daughter:public mother{
public:
daughter()
{cout<<"daughter\n";}
};
class son:public mother{public:
son(){cout<<"son\n";}};
int main(void){
daughter cymthial;
son daniel;
return 0;
