Question

Beginner’s question: I dared to introduce constants into my little program. I first resisted, but then I thought I should give it a try… to see that it doesn’t work.

Okay, this is what I have put in the very first line of my .m file:

#define kPageCurlSpeed = 2.5;

And this is what I put in my method:

[UIView setAnimationDuration:kPageCurlSpeed];

And behold… it doesn’t work and I get the compiler message that “expected expression before “=” token”… I have no idea of how to translate that into English.

I thought the compiler simply replaces kPageCurlSpeed with 2.5 — so this shouldn’t cause any problems. But I guess that’s just theory.

Any help would be very much appreciated.

Answer 1

You don’t need = in an #define or the semicolon afterwards. Just use

#define kPageCurlSpeed  2.5

Read e.g. this wikipedia article on C preprocessor.