#define - “=”之前的预期表达式的问题令牌 [英] Problems with #define - expected expression before "=" token

问题描述

新手的问题：我敢于在我的小程序中引入常量。我第一次抗拒，但后来我想我应该试试看，它不工作。

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.

好吧，这是我已经放在我的.m文件的第一行：

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

#define kPageCurlSpeed = 2.5;

这是我在我的方法中：

[UIView setAnimationDuration:kPageCurlSpeed];

注意...它不工作，我得到编译器消息expected expression before =token...我不知道如何将它翻译成英语。

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.

我认为编译器只是用2.5替换kPageCurlSpeed， t造成任何问题。但我想这只是理论。

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

任何帮助将非常感谢。

Any help would be very much appreciated.

推荐答案

在<$ c $中不需要 = c> #define 或分号后面。只需使用

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

#define kPageCurlSpeed  2.5

阅读例如关于C预处理器的维基百科文章。

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