Calculator Program Xcode Error Expected expression before '@' token

Question

I'm doing the Stanford xcode class CS193P assignment #2 and I'm getting some errors. The tasks is to write a calculator program with variables. I am using Xcode 3.2.6 www.stanford.edu/class/.../Assignment%202_1.pdf

I'm getting the error Expected expression before '@' token when I am declaring vp

#define VARIABLE_PREFIX @“%”


- (void)setVariableAsOperand:(NSString *)variableName
{
    NSString *vp = VARIABLE_PREFIX; (error is on this line) 
    NSString *variable = [vp stringByAppendingString:variableName];
    [self addObjectToExpression:variable];  
}

Does anyone know how to fix this problem? Message me if you have any questions. Thanks for your help!

Is that a verbatim copy of your code? Those quotes look like the wrong kind. — Biffen, May 24 '14 at 18:48
@Biffen Yes that was a verbatim copy. I just deleted the quotes and retyped them now and it solved my problem. Thanks! I wonder how I got the wrong quotes — user3406157, May 24 '14 at 18:51

score -1 · Answer 1 · answered May 24 '14 at 19:17

Quotes in C++ have to be of the right kind, i.e. " (U+0022, QUOTATION MARK). Some applications (read: not proper text editors) will convert typed quotes into ‘fancy’ ones, e.g. “ (U+201C, LEFT DOUBLE QUOTATION MARK) and ” (U+201D, RIGHT DOUBLE QUOTATION MARK).

Watch out for copying code via a word processor, e-mail composer, etc. And if you need to examine a character your text editor of choice might be able to do it (I know Emacs can), or you can use tools like this one.

Calculator Program Xcode Error Expected expression before '@' token

1 Answers1