Question

in c header file,Why I don’t have to include the define of some types I made,I can use it directly in header as long as I include the def in c file ? because that’s impossible in c++ I think,for example:

define.h

typedef int _int32;

object.h

_int32 num;

void   init();

object.c

#include define.h

void init()
{
 num = 12;
}

Answer 1

You can’t. Either your compiler is wrong, or you are (I bet on the latter). Post your entire code.

My guess is that you either:

• included object.h in define.h

• included some other file that has a declaration of num

• you’re not compiling your source code

Anyway, until you post your actual code we can’t tell for sure.

EDIT:

If your problem is that you can use _int32 without the include, bear in mind that _int32 can be a basic type on some platforms. But in your example, you’re using num, which is impossible.