NULL

object NULL(void);

This returns an object with a fixed serial of 0. It is important to note that this is a function so you must use it with round brackets (). This is different from the C language!

Therefor the following 2 code examples are equal:

// Example 1
if(getWeapon(this) == NULL () ) // Notice the () after NULL !!!
{
  systemMessage(this, "I am unarmed!");
}
else
{
  systemMessage(this, "I am armed!");
}

// Example 2
if(objtoint(getWeapon(this)) == 0)
{
  systemMessage(this, "I am unarmed!");
}
else
{
  systemMessage(this, "I am armed!");
}

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