#include <iostream>

using std::cin;
using std::cout;
using std::endl;

/*
 * This program takes a volume in gallons and converts the quantity to several
 * other volume units, finally liters.
 */
int main()
{
	// Ask for the quantity.
	cout << "Please enter a volume in gallons: ";
	double gal;
	cin >> gal;

	// A gallon is defined as 231 cubic inches.  So let's convert.
	int cuin_per_gal = 231;
	double cuin = cuin_per_gal*gal;
	cout << gal << " = " << cuin << " cubic inches." << endl;

	// An inch is defined as 2.54 centimeters.  So on we go.
	double cm_per_in = 2.54;  // Centemeters per inch.
	double cc = cuin * cm_per_in * cm_per_in * cm_per_in;
	cout << "   = " << cc << " cubic centimeters." << endl;

	// A cc is the same as a ml, so we can get liters.
	cout << "   = " << cc / 1000.0 << " liters." << endl;
}