Or not equal too question.

[thegadgetman]

I am having an issue with my While statement when asking user if they want to loop the program or not. Even if I put the correct response "Y" or "N" it still loops through the error check, I am assuming my logical OR statement is the cause but I am not sure how to fix it.

code:

//Ask user if they want to play again System.out.print("\n\t\t Would you like to play again?(Y/N) "); playAgain = userInput.next(); playAgain = playAgain.toUpperCase();            //Error check  to confirm that the users response was valid            while(!playAgain.equals("Y") || !playAgain.equals("N"))                  {                      System.out.println("ERROR: Your entry " + playAgain + " is not valid please enter Y for yes or N for no.");                      System.out.print("\n\t\t Would you like to play again?(Y/N) ");                      playAgain = userInput.next()                      playAgain = playAgain.toUpperCase();                  }

[jcollins1991]

Because you're looping both when it's neither of the two (or statements evaluates !F | !F, so T | T), and when one of them is true (or statement evaluates !T | !F, so T | F). What you want is either (!A & !B) or (!(A | B)).

[thegadgetman]

Okay I see why now. Thank you for taking the time to explain it to me and not just give me the answer.