FOR Keyword

FOR numeric-variable = numeric-expression TO numeric-expression
NEXT
 
FOR numeric-variable = numeric-expression TO numeric-expression STEP numeric-expression
NEXT

Creates a counting loop. In the first form, the loop variable increases by 1 each time control reaches NEXT.
In the second form, the loop variable changes by the STEP amount each time.

If STEP evaluates to a negative value, the variable will decrement towards the lower value.

Loops may be nested. NEXT closes the nearest unmatched FOR.

Note

start, to, and step are evaluated once at loop entry. The counter is initialised to start. The body executes at least once. On NEXT, the counter is increased by step and compared to to. The loop continues while (step > 0 AND counter <= to) or (step < 0 AND counter >= to). If step evaluates to 0, a runtime error is raised.

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Examples

Count up by 1

FOR I = 1 TO 5
    PRINT "I = "; I
NEXT

Count up by a custom step

FOR N = 0 TO 10 STEP 2
    PRINT N
NEXT

Count down with a negative step

FOR X = 5 TO 1 STEP -1
    PRINT X
NEXT

Real step size

FOR T# = 0 TO 1 STEP 0.25
    PRINT T#
NEXT

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See also: NEXT