2.8. Write a program that read radius of a circle and display area.

#include<stdio.h> 
#include<conio.h>
#define pi 3.1416
void main () 
{ 
int r;
float area;
clrscr ();
printf("Radius: ");
scanf ("d", &r);
area=pi*r*r;
printf("Area= %f", area);
getch();
}