Another n00b bug lol Boolean prob this time.

Question

Hey,
Got another problem. :(
Ok, the program ask's the user to input a letter from a-e. I decided to create a boolean (progok) to test wether they had entered a letter in this range correctly. I put in a do while (progok = false) loop so that it would keep on asking the user for the letter until they correctly chose a letter in the range from a-e.
Somethings gone wrong in my logic as the programs carries on looping even if the a letter is correctly entered from that range.
Here's the code.
import javax.swing.JOptionPane;
public class LetterProgram2 {
public static void main (String args[]) {
   String pickALet;
   String output;
   char letter;
   int guess;
   int a;
   a=0;
   boolean progok = (a>0 && a<6);
   do{
   pickALet = JOptionPane.showInputDialog ("please enter a lower case letter from (a to e)");
   output = "you selected a letter " + pickALet;
   letter = pickALet.charAt(0);
   switch (letter) {
   case 'a':
   a = 1;
   output = "you entered an a";
   break;
   case 'b':
   a = 2;
   output = "you entered a b";
   break;
   case 'c':
   a = 3;
   output = "you entered a c";
   break;
   case 'd':
   a = 4;
   output = "you entered a d";
   break;
   case 'e':
   a = 5;
   output = "you entered an e";
   break;
   default:
   output = "i did not recognise your entry";
   break;
   JOptionPane.showMessageDialog(null, output, "your letter", JOptionPane.INFORMATION_MESSAGE);
   }while (progok == false);
   guess =(int)(Math.random()*5 +1 ) ;
   System.out.println(guess);
   if (guess==a)
      System.out.println("The computer guessed the correct letter");
   else
      System.out.println("The computer guessed the letter incorrectly");
   System.exit(0);
   }Any ideas?
Thanks

Answer 1

First of all, you never set progok inside your loop. Secondly, using booleans as control varaibles is to be avoided. You don't need one here.