c define multiline macro?

Question

#define DEBUG_BREAK(a)\\
    if ((a)) \\
{\\
    __asm int 3;\\
}

I have defined a macro as above, and try to use it

#include \"test_d         


        

Answer 1

The macro

#define DEBUG_BREAK(a)\
    if ((a)) \
    __asm int 3;

works fine but

#define DEBUG_BREAK(a)\
    if ((a)) \
{\
    __asm int 3;\
}

doesn't! And I think anyone could guess why!! The new line operator is the problem making guy!

It takes

 __asm int 3;\
}

as

__asm int 3; }

where ; comments out what follows it (in assembly). So we will miss a } then.