:= and =?

[Luffy123]

What is the difference between the two?

I tried and it works still.

var num : int

num = 3
num := 3

both work.

the first one gets a warning though but still works.

[Amarylis]

The first one, while it does work, is supposed to be only for boolean expressions (comparison). The second one is the actual syntax for value assignment.

[mirhagk]

You should never use the first way, as within certain contexts it could be problematic (although those contexts might not be common in Turing)

[Raknarg]

Could you give us an example, mirhagk?

[Tony]

in C and such one might accidentally write code such as*

code:

if (counter := 3) {    % expecting counter to be 3

instead the code _assigns_ 3 to the counter, and the result is evaluated to be true.

* actual C code uses == for comparison and = for assignment.

[mirhagk]

That is precisely what I was thinking of Tony. Although I'm trying to think of a way this could happen in Turing. Does turing set equal operator return the value? Is the following possible?

[syntax="turing']
var num1:=42
var num2:int
var num3:=num2:=num1
[/syntax]

[evildaddy911]

no, turing gives you a syntax error

[mirhagk]

so then I can't think of a context where it'd be an issue