What does "+=" do?

[tonitoni1998]

i saw it in the code lock script
( http://www.frictionalgames.com/forum/sho...e=threaded ) from NaxEla

i couldnt find it anywhere else.

Code: (Select All)

void PressedButton(string &in entity)
{
    int buttonsPressed;
    
    AddLocalVarInt("ButtonsPressed", 1);
    
    playersGuessedCode += GetButtonPressed(entity);    /// HERE
    buttonsPressed = GetLocalVarInt("ButtonsPressed");
    
    AddDebugMessage("Buttons Pressed: "+buttonsPressed+"  Guessed Code: "+playersGuessedCode, false);
    
    if(playersGuessedCode == correctCode) {
        SetSwingDoorLocked("door", false, false);
        for(int i=0; i<=9; i++) {
            SetEntityActive("Button_"+i, true);
        }
        ResetCode();
        AddDebugMessage("Correct code!", false);
        
        return;
    }
    
    if(buttonsPressed == 4) {
        ResetCode();
        AddDebugMessage("Wrong code!", false);
    }
}