Circumference and Area of Circle Using C

/*
Circumference and Area of Circle
*/

#include<stdio.h>
#include<math.h> // To find the power of a number, for calculating area.

int main() {

 // Declaration of variables
 float PI = 3.14;
 float area, radius, circumference;

 // Take radius value as input from user
 printf("Enter the radius : ");
 scanf("%f",&radius);

 // Calculate area and circumference of circle
 area = PI * pow(radius, 2);
 circumference = 2 * PI * radius;

 // Print the result
 printf("Circumference : %f unit, Area : %f sq. unit", circumference, area);

 return 0;

}