One variation on a while loop is a "do-while loop."

~void main() {
int x = 0;
do {
    IO.println(x);
    x++;
} while(x < 5);
~}

You write do, some code inside of { and }, and then while, a condition inside of ( and ), and finally a semicolon.

do {
    <CODE HERE>
} while (CONDITION);

In most situations it works exactly the same as a regular while loop. The only difference is that the first time the loop is reached the condition for the loop is not checked.

~void main() {
int x = 0;
do {
    IO.println("this will run");
} while (x != 0);

while (x != 0) {
    IO.println("this will not run");
}
~}

One way to remember the difference is that in a "do-while loop" you always "do the thing" at least once.