C Program To Find Area And Circumference Of Circle

#include<stdio.h>
int main()
{
   int rad;
   float PI = 3.14, area, ci;

   printf("\nEnter radius of circle: ");
   scanf("%d", &rad);

   area = PI * rad * rad;
   printf("\nArea of circle : %f ", area);

   ci = 2 * PI * rad;
   printf("\nCircumference : %f ", ci);

   return (0);
}

Output:

Enter radius of circle: 56

Area of circle : 9847.041016 

Circumference : 351.680023