// PROGRAM:		dcheung_box.cpp
// PROGRAMMER:	David Cheung
// DATE:		09/19/06
// PURPOSE:		Calculate the surface area and the volume of a box.
// INPUT:		Length, height, and width - from keyboard
// OUTPUT:		Surface area and volume of the box - to the screen
// DESCRIPTION:

/*		Algorithm:

				Request the dimensions of the box from user
					Length (varLength)
					Width (varWidth)
					Height (varHeight)					
				Multiply 3 dimensions for volume
					Length * Width * Height
				Calculate the area
					Multiply L * W and double the result
					Multiply W * H and double the result
					Multiply H * L and double the result
					Add the three results together
				Show calculated volume and area
				
				Assuming the user knows not to mix different units,
				and not to include the units when inputting the variables.
*/

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
	// Declare variables
	float	varLength, 		// User input length
			varWidth, 		// User input width
			varHeight, 		// User input height
			totalVolume, 	// Calculated total volume
			totalArea,		// Calculated total area
			tmpArea1, 		// Variables 
			tmpArea2, 		// to be used 
			tmpArea3;		// to calculate the area
	
	// Use a fixed number notation, and show the decimal point
	cout << fixed << showpoint;
	
	// Start the program
	cout << "This program computes the surface area and the volume of a box.";
	cout << endl << endl;
	
	// Request the dimensions of the box from the user
	// Hopefully the user will only use one system of measurement
	cout << "Please enter the length of the box: ";
	cin >> varLength;
	cout << "                  width of the box: ";
	cin >> varWidth;
	cout << "                 height of the box: ";
	cin >> varHeight;
	
	// Confirm the inputs
	// Places 3 decimal places behind the decimal point
	cout << endl << "Dimensions of the box" << endl;
	cout << setprecision(3) << "    length: " << setw(6) << varLength << endl;
	cout << "    width: " << setw(7) << varWidth << endl;
	cout << "    height: " << setw(6) << varHeight << endl << endl;
	
	// Volume
	totalVolume = varLength * varWidth * varHeight;
	
	// Area
	tmpArea1 = 2 * (varLength * varWidth);
	tmpArea2 = 2 * (varWidth * varHeight);
	tmpArea3 = 2 * (varHeight * varLength);
	totalArea = tmpArea1 + tmpArea2 + tmpArea3;
	
	// Results
	cout << "This box has a surface area of " << setw(7) << totalArea << endl;
	cout << "               and a volume of " << setw(7) << totalVolume << endl << endl;
	
	// End
	cout << "Goodbye!" << endl;
	return 0;
}