#include <stdio.h>

/*
 * This program takes a volume in gallons and converts the quantity to several
 * other volume units, finally liters.
 */
int main()
{
	// Ask for the quantity.
	printf("Please enter a volume in gallons: ");
	double gal;
	scanf("%lf", &gal);

	// A gallon is defined as 231 cubic inches.  So let's convert.
	int cuin_per_gal = 231;
	double cuin = cuin_per_gal*gal;
	printf("%g = %g cubic inches.\n", gal, cuin);

	// 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;
	printf("  = %g cubit centimeters\n", cc);

	// A cc is the same as a ml, so we can get liters.
	printf("  = %g liters\n", cc / 1000.0);
}