WAP TO FIND AREA OF CIRCLE (USING MACRO)

 

#include<iostream.h>

#include<conio.h>

#define PI 3.14

{

      double area;

      int r;

      clrscr();

      cout<<”Enter the radius:”;

      cin>>r;

      area=PI*r*r;

      cout<<area;

      getch();

}