while, do

These keywords are used for looping. The general syntax is:

while (<expr>){

	//do this over and over again until <expr> is false

}

do {

	//do this once, then check <expr>, and keep doing until it is false

} while (<expr>);

where is a boolean expression.

The first of the above is called a while loop. It will execute the statements between the {} until its condition is false.

The second loop is a do-while loop. It will ALWAYS execute the statements in the {} once, then check the expression, and behave as a while loop from there on out.

Usage:

bool done = false;

while (!done){

	//do something, eventually setting done to true

}

do {

	//done is currently true, so this will happen only once.

} while (!done);