Not equal to in a do while loop [duplicate]

Question

For some reason a sentinel value will not work as expected

public static int play() {
        String input;int result;
        do {
        input = JOptionPane.showInputDialog("Do you want to play-Enter 1 if yes , 0 if no");
        result = Integer.parseInt(input);
        } while (result != 1 || result != 0);
        return result;
    }

This code above never works but it works just fine if i change the condition from while (result != 1 || result != 0); to while (result < 0 || result > 1);

Why is that so and how can i make not equal work in a do...while loop in java ?

Thanks

Answer 1

Use:

while (result != 1 && result != 0) {...}

This will execute the code, ONLY if result is NOT 0 or 1

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In your example, the boolean statement in the while loop will ALWAYS be equal to true because result can be equal to only 1 value:

while (result != 0 || result != 1)

If result is 1, then it is not equal to 0, if it is 0, then it can't be 1, so it will ALWAYS be true