/* COSC 304 section 2
   LUKE BURGESS
   luke_burgess@hotmail.com
   @00205854
   Oct 05 2000 */

// Lab task: Exercise 5.11, page 198 from "Java How To Program", Deitel & Deitel
// Applet to read in integers from user and convert to rows of asterisks (a histogram)

import javax.swing.JApplet;
import javax.swing.JOptionPane;
import java.awt.Graphics;

public class Exercise11p198 extends JApplet {

   final int ARRAY_SIZE = 5;
   int currentInput, yPos;
   int [] array;
   String output;

   public void init () {
      array = new int [ARRAY_SIZE];
      output = "";
      yPos = 25;
   }

   public void paint (Graphics g) {

      // Validate user inputs, limit total number to that specified in ARRAY_SIZE, and build histogram
      for (int i = 0; i < ARRAY_SIZE; i++) {
         currentInput = askInt ("Enter integer (between 1 & 30):");
         while ((currentInput < 1) || (currentInput > 30))
            currentInput = askInt ("Invalid input. Re-enter integer (between 1 & 30):");
         array [i] = currentInput;
         for (int j = 1; j <= array [i]; j++)
            output += "*";
         g.drawString (output, 25, yPos);
         yPos += 10;
         output = "";
      } // for()

   } // paint()

   public static String askLine (String prompt) {
      String userInput = JOptionPane.showInputDialog (prompt);
      return userInput == null ? "" : userInput;
   }

   public static int askInt (String prompt) {
      String userInput = askLine (prompt);
      try {
         return Integer.parseInt (userInput);
      }
      catch (NumberFormatException e) {
         return askInt ("Invalid input. Re-enter integer (between 1 & 30):");
      }
   }

} // class Exercise11p198