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Mr.Programmer

Wed Feb 27, 2008 7:15 pm


Kind of Stupid Question (+=,-=)

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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!


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Tony

Wed Feb 27, 2008 7:24 pm


RE:Kind of Stupid Question (+=,-=)

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


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Mr.Programmer

Wed Feb 27, 2008 7:26 pm


Re: Kind of Stupid Question (+=,-=)

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

If so then it makes sense. 

And thank you very much.


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Bored

Thu Feb 28, 2008 7:26 pm


Re: Kind of Stupid Question (+=,-=)

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


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BigBear

Thu Feb 28, 2008 7:34 pm


Re: Kind of Stupid Question (+=,-=)

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when you use := it means becomes or is therefore equal to and when you use += it means becomes itself plus whatever is next
So 
var word : string := "" %declares it as nothing
word := word +"hello" %is the same as
word+=word

-= means becomes itself - something

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

If so then it makes sense. 

And thank you very much.



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Clayton

Thu Feb 28, 2008 9:33 pm


RE:Kind of Stupid Question (+=,-=)

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I very much believe the :+ was a typo.