Kind of Stupid Question (+=,-=)

[Mr.Programmer]

My question is, what do these two things mean: ' += ' and ' -="?

I know that := means 'becomes', but these two i cant figure out. Here's an example:

vely -= GRAVITY
posx += round (velx)
posy += round (vely)

Thanks!

[Tony]

var += 42
is the short way of saying
var := var + 42

[Mr.Programmer]

Ohhh. Then i guess var -= 22 is like saying ' var :+ var - 22 '?

If so then it makes sense.

And thank you very much.

[Bored]

There's also other including *=, /=, div=, and I beleive there might be more that I'm missing.

[BigBear]

when you use := it means becomes or is therefore equal to and when you use += it means becomes itself plus whatever is next

code:

So var word : string := "" %declares it as nothing word := word +"hello" %is the same as word+=word

-= means becomes itself - something

code:

var num : int put "Enter a number: ".. get num num -= 2 put "Your number minus 2 is equal to ", num %even though you got num you change it to num := num - 2

You were a little confused when you said

Mr.Programmer wrote:

Ohhh. Then i guess var -= 22 is like saying ' var + var - 22 '?

If so then it makes sense.

And thank you very much.

[Clayton]

I very much believe the :+ was a typo.