/**
 * File name: WageCalculatorCUI.java
 * Author: Hongyan Wang
 * converted to Scanner for class demo: David Wills
 *
 * Description: The program accepts an employee's pay rate and number of hours 
 * worked in a week, and calculates the wage the employee earned for that week. 
 *
 * Others: The program has minimum error checking. It doesn't check the validity 
 * of number of hours worked. The program uses SavitchIn for input.
 */

import java.text.*;				// to use DecimalFormat
import java.util.*;             //Scanner

public class WageCalculator {
	// Constants
    private static final double MAX_HOURS = 40.0;   // Maximum normal work hours
    private static final double OVERTIME = 1.5;     // Overtime pay rate factor
	
    // main function
    public static void main (String[] args)
    {
	double payRate;       // Employee's pay rate
	double hours;         // Hours worked
	double wages;         // Wages earned
	
	Scanner input = new Scanner(System.in);
	
	while (true)
	    {
		// Get info. 
		System.out.println ("Enter pay rate (enter 0 or a negative number to quit): ");     
		payRate = input.nextDouble ();	
		
		if (payRate <= 0.0)
		    break;			// end of all employees; exit the loop
		
		System.out.println ("Enter hours worked: ");
		hours =  input.nextDouble ();                           
		
		// Calculate wage based on pay rate and hours worked
		if (hours > MAX_HOURS)                  // Is there overtime?
		    wages = (MAX_HOURS * payRate) +     // Yes
			(hours - MAX_HOURS) * payRate * OVERTIME;
		else
		    wages = hours * payRate;			// No
		
	    	// Display the result
	    	DecimalFormat	d2 = new DecimalFormat ("0.00");
	    	
		System.out.println ("\nThe wage should be " + d2.format (wages) + "\n");
	    }
    }
}