[-CaRRoT]

#if is known as a directive, its a preprocessor in PAWN and you can use them to check specific conditions.

You can choose what to compile and what to not, ex:

Код:

#define LIMIT 10
 
if (LIMIT < 10)
{
	printf("Limit too low");
}

which would compile as :

Код:

if (10 < 10)
{
	printf("Limit too low");
}

The compiler knows that its not true and never will be so it would give you a constant expression warning, so the only reason you would want to keep this code if someone changes the limit and recompiles, so that's when #if comes in play, Unlike normal if which give a warning if the expression is constant, #if expressions MUST be constant. So:

Код:

#define LIMIT 10
 
#if LIMIT < 10
	#error Limit too low
#endif

If the limit is too small, it would give you a compiler error instead of you having to manually test it as it would check the code.

Source: Wiki for examples.