/*
AUTHOR: [phear]crippler
FILE: circumference.cpp
PURPOSE: computes circumference of a circle when diameter is known.
*/
#include <iostream>
using namespace std;

double cir(double d);
int main()   {
	cout << "This program can calculate the circumference of a circle\nwhen the diameter is known.\n" << endl;
	
	double d;
	char again;
	cout.precision(4);

	do {
		cout << "Enter the diameter: ";
		cin >> d;
		cout << "The circumference is: " << cir(d) << endl;

		cout << "Do another? (Y/N): ";
		cin >> again; 
		cout << endl;
	} while(again == 'y' || again == 'Y');
	return 0;
}
double cir(double d = 0.0)
{   return 3.14159 * d;   }