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How does this function work?

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while(var)
{
?
}


It's a loop mechanism.

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while(condition is true)
{
    // do something
}

So if you wanted to simulate a for loop you could do it like this.

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int i=0;
while(i<10)
{
    // do something
    i++;
}

Just make sure the while loop is escapable. There is also do while, which runs the code first, and then checks if it needs to loop.

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do
{
    // do something
}while(condition);
// notice, you need the semicolon after this while (but not the other)

there are two varients. The normal while

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while(Conditional Statement)
{
    do things here while the Conditional Statement is true
}

and the do-while

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do
{
    do things here
}while(Conditional Statement)

The first while loop will ONLY run if Conditional Statement is true, but if the condition is not met, the code won't get run at all.
If the Conditional Statement is true, then the code will keep on running until the Condition Statement returns false.

The do-while loop is the same thing, except that the code will get run at least once!

EDIT:
Aww, sky beat me to it xP

Thanks guys now does this happen all in 1 frame, like using for(i=0;ect..)?

Yeah. Any code in any event must finish before the game can move on. So, if you had an infinite while loop, the game would freeze.

Oh I see. Thanks :3