Can anyone tell me exactly why this is equal to zero?

read it out loud, it helps, while bigger than 0 do minus 3, so it does:

12
9
6
3
0

then it exits because 0 isn't bigger than 0

What output did you expect and why?

While the number is greater than zero, subtract 3 from it

So it will run 5 times (15/3=5)

At the end (after the while loop) the number has a value of 0, because you subtracted 3 from it, 5 times (15-3-3-3-3-3=0)

@JoshBent omygosh duh Thank you so much !!=p

@Scade I was thinking 12

@lmute

that hair or scratch on your monitor is really disturbing though, so maybe remove that if its not physical damage 😅

0

@Bitwise me too 😅

especially I hate languages like python where indentation is a part of the semantics of the language

@JoshBent lmfao I'm guessing it was my dogs hair I'm not sure I didn't even notice it hahah.

You can get better help from StackOverflow, Just Saying..

@jaydevs SO will give you -8 for posting this. And the first comment will read "we do not do homework" or something like that.

Well since non of the options is infinite loop and there are no negative numbers in the answer options, answer is 0, got my two grades and pass the exam 😀

Just how I think in exam no need to be nerdy and ask why happens

It would be 13 if it weren't a loop.

Not knowing how "imaginary" brackets work as a beginner can be a bit frustrating and confusing.

So your code really looks like this

int num = 15;

while ( num > 0 )

{

num = num - 3;

}

System.out.println(num);

In most modern languages (assuming this is probably C, C# or Java), its kind of allowed to just write an if(), a while or for without brackets if its just ONE line of code that gets repeated. You can see the syntax checker questioning your code sometimes if theres a line of code below "imaginary brackets" .

But the big giveaway here is the spacing. Do you see that num = num - 3 is tabbed to the right?

Most IDEs do that for you when you write a while, if or for above it. (also else if, else, you get the idea)

Its an indicator that its a loop for just ONE line.

If it would be an if(num > 0) num = num - 3; It would be 12, since if's do not loop.

That's what you get when you don't use curly braces in while-loops. At least for me non-curled variants do not register as proper loops in my brain, instead I see it first as a statement that is run only once. I have to do some gazing before my brain registers that there is a loop.

TL;DR: use curly braces for readability. And yes, I'm this zealous on this matter. :)

Indentation matters ;)

Because 15 is divisible by 3

It would be "13"´,

15 - 3 = 13

Yes I can math.

3 more ++ and I can get a sticker =)

15 is multiple of 3. 15=5*3