// PROGRAM:		dcheung_hours.cpp
// PROGRAMMER:	David Cheung
// DATE:		10/09/06
// PURPOSE:		Calculate usage charges for certain hours of the day.
// INPUT:		Time of day in hour (24 hr clock)
//				Usage charge
// OUTPUT:		Function of the program
//				Instructions on how to exit the program
//				Proper prompts for each input
//				Normal or discounted charge with proper description
// DESCRIPTION:

/*		Algorithm:

				Input the time of day in hour based on a 24hr clock
							
				While time of day is > 0
					
					Input the usage charge per hour				
				
					If time of day is less than 8 or greater than 17
						Actual usage equals 20% of usage
						Display discounted charge
					Else
						Actual usage equals usage
						Display peak hours - no discount
					
					Input the next time of day in hour based on 24hr clock
									
				End while loop
*/

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
	int varHour;							// Time of day
	float varStdUsage, varActualUsage;		// Usage charges
	
	// Use a fixed number notation and show the decimal point
	cout << fixed << showpoint;
	
	// Start the program
	cout << "Cost Adjuster" << endl << endl;
	cout << "Enter a negative time to quit" << endl << endl;
	cout << "Hour -> ";				// Initial Time of day goes here
	cin >> varHour;
		
	while (varHour >= 0)	// As soon as varHour goes negative, break the loop
	{
		cout << setprecision(2) << "Charge -> ";	// Regular charge goes here
		cin >> varStdUsage;
		
		if (varHour < 8 || varHour > 17)	// Off-peak discount
		{
			varActualUsage = varStdUsage * 0.8;		// Calculate the discount
			cout << "Normal Charge -> " << varStdUsage << endl;
			cout << "Discounted Charge -> $" << varActualUsage << endl;
		}
		else		// Peak hours? no discount for you!
		{
			varActualUsage = varStdUsage;	
			cout << "Normal Charge -> " << varActualUsage << endl;
			cout << "Peak Hours - no discount" << endl;
		}
		
		cout << endl;
		cout << "Next hour -> ";		// Start over unless hour is negative
		cin >> varHour;
	}
	
	cout << endl << "Bye!";
	// system("pause");		// This is a DOS-specific command
	return 0;
}