// 10/23/2017

/** The Payroll class calculates the Net Pay for two
 *  employees. This is version 5 of the Payroll class.
 *  This version uses a while loop illustrating different kinds
 * of conditions for terminating the loop.
 * 
 * 1.  read in a value
 * 2.  ask the user if he/she wants to continue
 * 3.  use sentinel
 * Algorithm for counting using a while loop
 * Validating input with while loop
 * Summing using a while loop
 * for loop
 */

import java.util.Scanner;

public class Payroll5c {
  /**
   * pay is calculated by multiplying hours times rate, and
   * then subtracting 11% for taxes.
   */
  public static void main(String[] args)   {
    
       final double TAXES = .11; // employees pay 11% income tax
       double taxes=0.0, rate=0.0, pay=0.0; 
       int hoursWorked=0;
       String name;  
       Scanner readObject = new Scanner(System.in);
       int numEmployees=0;
       double totalPay=0.0;
       
      int idnum;
      System.out.print("Enter idnum (-1 to exit): ");
      idnum = readObject.nextInt();
      
      // Structured Read Loop
       while (idnum !=-1) {
         readObject.nextLine(); // to skip newline in input buffer
         // prompt the user to enter a name
         System.out.print("Enter a name of employee: ");
         name = readObject.nextLine();
         // prompt the user to enter data for hours and rate
         System.out.print("Enter number of hours worked and rate of pay: ");     
         hoursWorked = readObject.nextInt();
         rate = readObject.nextDouble();
         pay = rate * hoursWorked;
         taxes = TAXES*pay;
         pay-=taxes;
         totalPay+=pay; // add this employee's pay to the total
         System.out.println("ID     Name   Hours   Rate     Pay");
         System.out.println("----------------------------------");
         System.out.printf("%d %s  %4d $%4.2f $%,8.2f\n",idnum, name, hoursWorked, rate, pay);
         numEmployees++;
         readObject.nextLine(); // to skip newline in input buffer
         // end of loop read for Structured Read Loop
         System.out.print("Enter idnum (-1 to exit): ");
         idnum = readObject.nextInt();
         }
       System.out.println("You entered " + numEmployees + " employees." +
                       "\nTotal Pay is: " + totalPay);
  }
}
/* Lab assignment:
  Review: counting with while loop
  Review: writing methods
  Write a method that uses the while loop. The method should
  read in a number from the keyboard.
  The method will count how many numbers < the input number are divisible
  by 5.
  The method should return this number.
  Pseudocode for method:
     1. read in a number
     2. initialize divisor to 5
     3. while (divisor < number)
            increment counter
            add 5 to divisor
     4. return counter
  */