I got a bit confused why the engine does not differ between 0 and NULL. Is there a reason for it? Because it is a lot more handy if you can distinguish between these things. As example if you want to determinate, that a variable didn't get value OR has the value 0.

It would be great if that can be added.

Thank you
Scorpion

Whats the difference between 0 and NULL? I thought its just two ways to express the same thing.

0 is the integer zero, indicating a variable, integer, double (...)

Imagine 0 as the byte "00000000"

NULL is a pointer to a zero memory address that contains... well, Nothing. NULL is neither "0" nor has *any* value.

No, NULL is not a pointer to a zero memory address. In C/C++ NULL is a constant with the value 0x00000000. Which is the same as 0. Thats why I didnt understand what Scorpion meant.

it may be in C-Script, but in many other languages the comparison

if(0 == NULL)
{
echo "The same";
}

will never be true.

litec.h:
#define NULL 0

if (0 == NULL)

is the same as

if (0 == 0)

and always true in any language. Try it.

Python: 0 == nil -> false

As you can see nil is a special type in python and not equal 0 to indicate that an object is invalid. And maybe in many other script languages too, because it's a handy feature.

NULL is just an old C-Lang thing. I use always 0 in my code.

c#

0 == null > false

php

0 === null > false

Well I think I posted this a bit too fast. I looked it up and it's really defined as 0 (or in C: (void*)0 ). So I was misinformed there.

But then may I ask the question why that NULL exists? When is/was it used for which purpose?