为什么海湾合作委员会不这样？

Question

I am trying to learn C and finding myself getting stuck a lot, no complains :)

Anyway, I wrote a program and GCC does not like it. The following code is NOT the program, but demonstrate the problem:

#define MAXLINE = 1000

int main()
{
   int tmp = MAXLINE;
   char line[MAXLINE];

   return 0;
}

When it is compiled, I get the following error:

test.c:7: error: expected expression before '=' token

If I replace symbolic constant MAXLINE with int 1000, everything works.

What is going on?

Answer 1

When the preprocessor replaces your definition of MAXLINE , your code is changed to

int main()
{
   int tmp = = 1000;
   char line[= 1000];
   return 0;
}

The C preprocessor is very dumb! Do not put anything extra in your #defines (no equals, no semicolons, no nothing)

Answer 2

定义不需要等号:)

#define maxline 1000

Answer 3

不应该只定义=

#define MAXLINE 1000

Answer 4

The #define statement doesn't need the equals sign.

It should read:

#define MAXLINE 1000

Answer 5

使用#define而不是'='：

#define MAXLINE 1000

Answer 6

You shoud have

#define MAXLINE 1000

You can read more here http://gcc.gnu.org/onlinedocs/cpp/Object_002dlike-Macros.html#Object_002dlike-Macros

Answer 7

#define MAXLINE 1000