While

Beginning of a while loop. The statements between a ‘while’ and a ‘repeat’ should ultimately push a value to the stack that will determine if the loop executes the body of the ‘repeat’ block.

A while loop is a control flow statement that allows code to be executed repeatedly based on a given Boolean condition. The while loop can be thought of as a repeating if statement.

5 ->y
while   <-y gt(0)    #is y greater than zero?
repeat              #repeat this section of code
    trace(<-y)
    <-y sub(1) ->y   #subtract 1 from y so we don't end in infinite loop
endwhile

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