Area Of Circle

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 //Program 3 : Area of Circle from Radius 
//Downloaded from www.c4cprog.co.nr 
#include<conio.h> 
#define pi 3.14 
void main() 
{ 
int r; 
float a,c; 
clrscr(); 
printf("Enter The Radius \n"); 
scanf("%d",&r); 
a=pi*r*r; 
c=2*pi*r; 
printf("The Area is : %f",a); 
printf("\nThe Circumference is : %f",c); 
getch(); 
}