C Program for Circumference of a Circle

The Circumference of a Circle can be calculated using the formulae 2*PI*r

In the below c program, the PI value taken as 3.14.

All the values dealing with Decimals, so float is a Datatype. 

int is not a right datatype, it will remove all the decimal parts of output.

#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 for Circumference of a Circle:

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