Need help - I can't figure it out.

[Joshsmith]

boolean correct = false;

do{ 
   numTextBook = Integer.parseInt(JOptionPane.showInputDialog("How many text books are you buying?"));
   if(numTextBook >= 0 && numTextBook <= 6)
      correct = true;
} while (numTextBook >= 0 && numTextBook <= 6);

I'm not sure what to do with the while to make this code work.

Any help would be appreciated!

[toymachiner62]

boolean correct = false;

do{ 

    numTextBook = Integer.parseInt(JOptionPane.showInputDialog("How many text books are you buying?"));

    if(numTextBook >= 0 && numTextBook <= 6)
        correct = true;
    }

while (numTextBook >= 0 && numTextBook <= 6);

What do you want it to do? Right now it's going to go through the DO at least once, and if numTextBook is between 0 - 6 it's going to set correct = true. and if it's true it's going to keep going in the loop indefinitely.

[Fubarable]

You've got a boolean variable, correct, why not use it in the while condition? Which would work better do you think,

while (correct); // repeat while correct input given

or

while (!correct); // repeat while correct not yet given