#include<iostream.h>
#include<conio.h>
class ar
{private:float a;
 public:ar()
	{a=0;}
	~ar()
	{a=0;}
	void area(float x)
	{a=3.4142*x*x;
	}
	void area(float x,float y)
	{a=x*y;
	}
	void area(float x,float y,int u)
	{a=(x*y)/2;
	}
	void showarea()
	{cout<<"\n the area of the figure is:"<<a;
	}
}n1;
void main()
{int n=0,i;
 float h,b,r;
 clrscr();
 while(n!=1)
 {clrscr();
  cout<<"\n enter the choice of figure whose area is to be calculated \n1-circle\n2-rectangle\n3-triangle\nenter your choice:";
  cin>>i;
  switch(i)
  {case 1:cout<<"\nfor circle\n";
	  cout<<"\n enter the radius of the circle:";
	  cin>>r;
	  n1.area(r);
	  n1.showarea();
	  break;
   case 2:cout<<"\nfor rectangle\n";
	  cout<<"\n enter the  length of the rectangle:";
	  cin>>h;
	  cout<<"\n enter the width of the rectangel:";
	  cin>>b;
	  n1.area(h,b);
	  n1.showarea();
	  break;
   case 3:cout<<"\nfor triangle\n";
	  cout<<"\n enter the  height of the triangle:";
	  cin>>h;
	  cout<<"\n enter the base length of the triangel:";
	  cin>>b;
	  n1.area(h,b,1);
	  n1.showarea();
	  break;
   default:cout<<"\n sorry you have entered wrong choice\n";
  }
  cout<<"\n do you want to continue (yes:0,no:1):";
  cin>>n;
 }
 getch();
}