/* Java program to compute an employee's gross and net pay for a week.
** A fixed percentage of gross pay is deducted for taxes.
** There is no consideration given to overtime pay.
** Input is simulated using assignment statements (i.e., the input 
** values are "hard-coded" within the program).
** Use of procedural decomposition led to the introduction of separate 
** methods for computing gross pay, tax, and net pay.  Each of these 
** methods assigns the computed value to a global variable.  This is not
** the preferred way of doing things, but we resort to it because, at 
** this point in the course, we have neither parameter passing nor
** functional methods at our disposal.
**
** Author: R. McCloskey
** Date: Sept. 2016 (modified Sept. 2023)
*/

public class GrossNetPay1 {

   static final double TAX_RATE = 0.1825;  // symbolic constant

   static double hoursWorked, hourlyWage;  // inputs, in a sense
   static double grossPay, netPay;         // outputs
   static double tax;                      // auxiliary variable

   public static void main(String[] args) {

      hoursWorked = 42.8;   // In a contrived fashion, assign values 
      hourlyWage = 14.58;   // to the input variables.

      computeGrossPay();
      computeTax();
      computeNetPay();

      reportResults();
   }


   /* Computes gross pay and assigns the result to the proper global variable.
   ** Assumes ability to access global variables containing values for hours
   ** worked and hourly wage.
   */
   private static void computeGrossPay() {
      grossPay = hoursWorked * hourlyWage;
   }

   /* Computes tax and assigns the result to the proper global variable.
   ** Assumes ability to access global variables containing values for gross
   ** pay and tax rate.
   */
   private static void computeTax() {
      tax = grossPay * TAX_RATE;
   }

   /* Computes net pay and assigns the result to the proper global variable.
   ** Assumes ability to access global variables containing values for gross
   ** pay and tax.
   */
   private static void computeNetPay() {
      netPay = grossPay - tax;
   }

   /* Prints a message reporting the employee's hours worked, hourly wage,
   ** gross pay, and net pay.  Assumes ability to access global variables
   ** containing the values of these quantities.
   */
   private static void reportResults() {
      System.out.println(hoursWorked + " hours worked at $" +
                         hourlyWage + " per hour");
      System.out.println("yields gross pay of $" + grossPay +
                         "\nand net pay of $" + netPay);

   }

}