// Exercise 4.13 Solution: Sales.java
// Program calculates commisions based on sales.

// Java core packages
import java.text.DecimalFormat;

// Java extension packages
import javax.swing.JOptionPane;

public class Sales {

   // main method begins execution of Java application
   public static void main( String args[] )
   {
      double gross = 0.0, earnings;
      int product = 0, numberSold;
      String input;

      while ( product < 4 ) {
         product++;

         // read number from user as String
         input = JOptionPane.showInputDialog(
            "Enter number sold of product #" + product + ":" );

         // convert numbers from type String to type int
         numberSold = Integer.parseInt( input );

         // determine gross of each individual product and
         // add to total gross.
         if ( product == 1 )
            gross += numberSold * 239.99;

         else if ( product == 2 )
            gross += numberSold * 129.75;

         else if ( product == 3 )
            gross += numberSold * 99.95;

         else if ( product == 4 )
            gross += numberSold * 350.89;

      }  // end while

      DecimalFormat twoDigits = new DecimalFormat( "0.00" );

      earnings = 0.09 * gross + 200;
      String result = "Earnings this week: " +
         twoDigits.format( earnings );

      JOptionPane.showMessageDialog( null, result, "Sales",
         JOptionPane.INFORMATION_MESSAGE );

      System.exit( 0 );

   }  // end method main

}  // end class Sales