# OK what on earth does this mean?

**URL:** <https://forum.kirupa.com/t/ok-what-on-earth-does-this-mean/311529>\
**Category:** Uncategorized\
**Created:** [July 9, 2010, 3:26am UTC](https://forum.kirupa.com/t/ok-what-on-earth-does-this-mean/311529 "2010-07-09T03:26:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zerdang](https://avatars.discourse-cdn.com/v4/letter/z/ecb155/32.png) [@zerdang](https://forum.kirupa.com/u/zerdang)\
**Post date:** [July 9, 2010, 3:26am UTC](https://forum.kirupa.com/t/ok-what-on-earth-does-this-mean/311529/1 "2010-07-09T03:26:21Z")

</div>

So I was using a handy dandy tutorial that I’d found and I came across A double equals sign ==

```auto

if (numPoints **[COLOR=Black]==[/COLOR]** 0) { 
        point1.x = evt.localX;
        point1.y = evt.localY;
        drawBoard.addChild(point1); 
        numPoints = 1;

```

it was used like that to create a drawing board for other objects to be drawn.

also what do the ++, +=, and -= mean?  
thank you in advance