What does += mean?

[CheshireFox]

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

Thanks in advance to anyone who replies

[Insectoid]

Why not try it out?

[CheshireFox]

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

[Insectoid]

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

[CheshireFox]

if I insert put then an error appears.

[GreatPumpkin]

Turing:

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:

Turing:

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

[CheshireFox]

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

[GreatPumpkin]

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

[Raknarg]

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)

[Dreadnought]

Raknarg wrote:

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

Turing:

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.

[Raknarg]

Good point, forgot about those

[Dreadnought]

Raknarg wrote:

Good point, forgot about those

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