C - Calculate area of circle and circumference

Q5. WAP to input radius and calculate area of circle and circumference of a circle. Area of circle = 3.14*r*r, Circumference of circle = 2*3.14*r. 1

#include<stdio.h>
void main()
{
	float r, a, c;
	printf("Enter radius:");
	scanf("%f", &r);
	a=3.14*r*r;
	printf("Area of circle = %f\n", a);
	c = 2*3.14*r;
	printf("Circumference of circle = %f\n", c);
}