C Program to Calculate Circumference of a circle

/*Program to Calculate Circumference of a circle*/

#include<stdio.h>

#define PI 3.14

main()

{

      float r,c;

      printf("\n Enter the Radius");

      scanf("%f",&r);

      c=2*PI*r;

      printf("\n Circumference of circle with Radius %f is %f",r,c);

}