// inheritance example
// multiple inheritance
#include<iostream.h>
#include<conio.h>
class cpolygon
{
  protected:
  int width,height;
  public:
  void setvalues(int a,int b)
 {
  width=a;
  height=b;
 }
};
class coutput
 {
  public:
  void output (int i);
 };

 void coutput::output (int i)
 {
  cout<<i<<endl;
 }
class crectangle :public cpolygon,public coutput
{
  public:
 int area()
 {
  return(width*height);
 }
};
class ctriangle:public cpolygon,public coutput
 {
  public:
 int area()
 {
  return (width*height/2);
 }
 };
void main()
{
clrscr();
 crectangle rect;
 ctriangle trgl;
 rect.setvalues (4,5);
 trgl.setvalues (4,5);
 rect.output (rect.area());
 trgl.output (trgl.area());
getch();
}

/* 
----OUTPUT----
20
10
*/