CW 1-3

#include<stdio.h>
int main()
{
   int x;
   scanf("%d",&x);
   int d=2*x;
   float c=2*3.1416*x;
   float a=3.1416*x*x;
   printf("Diameter = %d\n",d);
   printf("Circumfernce = %.2f\n",c);
   printf("Area = %.2f\n",a);

 return 0;

}