Thread: invalid lvalue in assignment for the while loop in my code

The reason you are getting the error is because || has a higher precedence than =. The following expression:

Code:

userInput = 'B' || userInput = 'D' || userInput = 'Q'

is equivalent to:

Code:

userInput = ('B' || userInput) = ('D' || userInput) = 'Q'

And because the = operator has right-to-left associativity, the compiler complains that:

Code:

('D' || userInput)

which results in a boolean value, is an invalid lvalue. (It's like trying to say true = 'X'.)


Of course, what you probably meant was to use the == operator, which produces the much more reasonable expression:

Code:

userInput == 'B' || userInput == 'D' || userInput == 'Q'

The following lines should also be producing errors though:

Code:

        char 'B';
        char 'C';
        char 'Q';
        char 'X';

Not sure what you had in mind when you wrote that.