Loops

ENG has Repeat and While.

Repeat a fixed number of times

Repeat 3 times
    Print "hi".
End.

Output:

hi
hi
hi

The repeat count is evaluated once and stored internally as a counter. The body executes while the counter is greater than zero.

Repeat using an expression

Let count be 3.

Repeat count times
    Print "hello".
End.

While

Let count be 0.

While count is less than 3
    Print count.
    Set count to count plus 1.
End.

A While loop reevaluates its condition each iteration.

Avoid accidental infinite loops

Make sure the state used by the condition changes:

Let count be 0.

While count is less than 3
    Set count to count plus 1.
End.

If count never changes, the condition can remain true forever.

Nested loops

Because loop bodies are normal statement blocks, loops can be nested:

Repeat 2 times
    Repeat 3 times
        Print "x".
    End.
End.