code for caculating area

#include"stdio.h"
#include"conio.h"
int r,b;
#define pi 3.1415
#define area(r) 4*pi*r*r
void main()
{
    printf("Enter the radius \n");
    scanf("%d",&r);
    b=area(r);
    printf("Area is %d",b);
    getch();
}

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