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CheshireFox

Sat Mar 22, 2014 7:30 pm


What does += mean?

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As the topic stated above, what does += mean? 

Thanks in advance to anyone who replies


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Insectoid

Sat Mar 22, 2014 7:32 pm


RE:What does += mean?

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Why not try it out?


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CheshireFox

Sat Mar 22, 2014 7:37 pm


Re: What does += mean?

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I did...though when i run it nothing happens....(the run window doesn't even open)


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Insectoid

Sat Mar 22, 2014 7:38 pm


RE:What does += mean?

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You can't see what happens if you don't output something. Try using the put command after you use it.


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CheshireFox

Sat Mar 22, 2014 7:42 pm


Re: What does += mean?

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if I insert put then an error appears.


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GreatPumpkin

Sat Mar 22, 2014 8:07 pm


Re: What does += mean?

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var number : int
number := 5
put number
number += 1
put number


Try that.

You'll notice it's essentially the same thing as:
number := number + 1

It's a shortcut for adding what comes after to the variable being operated on.

You can also use it in operations with other variables:



var number2 : int := 2
var number1 : int
number1 := 5
put number1
number1 += number2
put number1



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CheshireFox

Sat Mar 22, 2014 8:13 pm


Re: What does += mean?

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Thank you! You wrote it in a very easy to understand way with examples.


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GreatPumpkin

Sat Mar 22, 2014 9:47 pm


Re: What does += mean?

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You're welcome, check out the Turing Walkthrough: http://compsci.ca/v3/viewtopic.php?t=8808


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Raknarg

Sat Mar 22, 2014 10:54 pm


RE:What does += mean?

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Other shorthands: 

a /= b is the same as a := a/b
a *= b is the same as a := a*b
a -= b is the same as a := a-b
a ~= b is the same as not(a = b)


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Dreadnought

Sat Mar 22, 2014 11:51 pm


Re: What does += mean?

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Other shorthands 

a /= b is the same as a = a/b
a *= b is the same as a = a*b
a -= b is the same as a = a-b
a ~= b is the same as not(a = b)

There's one for almost every operator you can think of
a **= b  % a := a ** b
a div= b  % a := a div b
a rem= b  % a := a rem b
a mod= b  % a := a mod b
a |= b  % a := a | b (bitwise OR)
a &= b  % a := a & b (bitwise AND)
a xor= b  % a := a xor b

I think that along with the above that's all of them.

Notice that since a occurs once in one form and twice in the other, it is possible for the behaviors to be different if a has some kind of side-effect associated to it.


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Raknarg

Sat Mar 22, 2014 11:54 pm


RE:What does += mean?

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Good point, forgot about those


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Dreadnought

Sun Mar 23, 2014 12:03 am


Re: What does += mean?

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Good point, forgot about those

I only just found out about **= when I tried it out. :P