Program to find circumference and area of a circle

Circumference of circle = 2*pi*r
Area of circle = pi*r*r

# include<stdio.h>

#include<conio.h>

void main()

{

int r;

float pi=3.14, area, circ;

clrscr();

printf("Enter radius of circle");

scanf("%d", &r);

area= pi*r*r;

circ= 2*pi*r;

printf("Area= %f",area);

printf("Circumference= %f",circ);

}