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This adds a FOR statement, following this syntax:

FOR i FROM x TO y STEP z DO
    #FOR body
NEXT

where i is a number variable and x, y and z are number variables or literals.

First, it assigns x to i and starts an iteration. At the start of an iteration, the condition i <= y is evaluated if x < y and i >= y otherwise. If the condition passes, the FOR body is executed, if it fails the loop ends. After the body is executed, i is incremented by z and a new iteration is started (checking the condition and so on).

The BREAK and CONTINUE statements can be using inside FOR loops.

I used NEXT to mark the end of a FOR loop, but it could be REPEAT like in the WHILE loop without any trouble, if you prefer it.

Examples:

DATA:
i is number
PROCEDURE:
for i from 0 to 10 step 2 do
    if i is greater than 7 then
        break
    end if
    display i " "
next

outputs 0 2 4 6 .

DATA:
i is number
PROCEDURE:
for i from 5 to 0 step -1 do
    if i is equal to 3 then
        continue
    end if
    display i " "
next

outputs 5 4 2 1 0 .