while loop not working

[Christa912]

while( !word.equals("q") || !word.equals("Q") )

The program needs to except both lowercase and uppercase,but it doesn't work if I add the uppercase or statement. It works with just !word.equals("q"). I've tried word.LowerCase() but it doesnt change it.

Help!

[gimbal2]

There is an equalsIgnoreCase() you know.

When in doubt, always start by checking out the API documentation.

String (Java Platform SE 7 )

As for your current code, you want to use &&, not ||. Read it out in English. "It shouldn't be q AND it shouldn't be Q".

[jim829]

I assume you want to continue the loop until either a 'q' or a 'Q' is entered.

while (!word.equalsIgnoreCase("q")) {

}

Regards,
Jim

[jim829]

Also, your previous statement:

while( !word.equals("q") || !word.equals("Q")  )

is the same as this:

while (!(word.equals("q") && word.equals("Q")))   // see De Morgan's laws

Since the word can't be equal to "q" and "Q" at the same time it evaluates to false. So ! false == true and the loop never ends.

Regards,
Jim

PS. I was nice; Gimbal2 was helpful

[JosAH]

Since the word can't be equal to "q" and "Q" at the same time it evaluates to false. So ! false == true and the loop never ends.

s/ends/starts

kind regards,

Jos

[jim829]

Well, the following runs forever.

public class Snippet {
  
   public static void main(String[] args) {
     String word = "A";
     
     while (!word.equals("q") || !word.equals("Q")) {
        System.out.println("hello");
     }
   }

}

Regards,
Jim

[JosAH]

hrmph, I'm blind; I missed the '!' and mixed up the '||' and '&&' and I'm without Grolsch and the weather has been lousy here all day ...

kind regards,

Jos