Question

I am doing the following in C

#define MAX_DATA_SIZE 500;

struct reliable_state {

  char dataBuffer[MAX_DATA_SIZE]; 

}

i.e I want to use the #define constant as array size in structure declaration. But above code gives weird error

.c:36: error: expected ‘]’ before ‘;’ token

So is there any other way to do this?

Answer 1

Yes you can, just remove ; in your define line:

#define MAX_DATA_SIZE 500

如果界定你有汇编者,那么你的结构定义实际上将被视为你的结构定义。

char dataBuffer[500;];

which is clearly erroneous.

Answer 2

当你使用<代码>#define时,右边的宏观定义是“......”。比如,你刚才必须纠正这种情况。

#define MAX_DATA_SIZE 500  /* no semicolon */

Answer 3

The syntax for a non-empty object-like macro definitions is

#define MACRO_IDENTIFIER    REPLACEMENT

请注意,与C类声明和声明不同,这一辛迪加没有消灭半殖民地。你们的半殖民地成为REPLACE的一部分,在你们使用宏观识别标志、产生结果的地方被插入。

char dataBuffer[500;];

这是编辑诊断出的一起错。