#include<stdio.h>

int main ()
{

  float radius, circumference;

  printf (" Enter the Radius of Circle:");

  scanf ("%f", &radius);

  circumference = 2 * 3.14 * radius;

  printf ("\nThe Circumference of a Circle is %f", circumference);

  return 0;

}

OUTPUT:

Enter the Radius of Circle:8                                                                                                         
                                                                                                                                      
The Circumference of a Circle is 50.240002