//Program to Calculate Area of Circle, a Rectangle or a Square

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

{clrscr();

int r,L,B,s;

int ch;

 float area;

       cout<<"\n press 1 for circle";

       cout<<"\n press 2 for rectangle";

       cout<<"\n press 3 for square";

       cout<<"\n enter your choice :";

       cin>>ch;

 switch(ch)

{case 1:cout<<"\n enter the radius:";

 area=3.14*r*r;

 cout<<"\n"<<"the area of the circle is"<<area<<"\n";

 break;

 case 2:cout<<"\n enter length and breadth of rectangle:";

 cin>>L>>B;

 area=L*B;

 cout<<"\n"<<"the area of rectangle is"<<area<<"\n";

 break;

 case 3:cout<<"\n enter the sides of square:";

 cin>>s;

 area=(s*s);

 cout<<"\n"<<"the area of the square is"<<area<<"\n";

 break;

 default:cout<<"\n wrong choice entered";

}

getch();

}