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

With define you have compiler will actually ‘see’ your struct definition as

char dataBuffer[500;];

which is clearly erroneous.