#include<iostream.h>
void ComputeCirc(double& area, double& circumference, double radius)
{
const double PI = 3.141592653589793;
area = PI * radius *radius;
circumference=2 * PI * radius;
}

void ComputeCirc(double&, double&, double);

main()
{

double r,a,c;
cout<<"Enter the radius: "<<endl;
cin>>r;
ComputeCirc(a,c,r);
cout<<"The area is: "<<a<<" and the circumference is: " <<c<<endl;
}