FOR

The FOR executes the commands in the block enclosed by the FOR statement and the corresponding END as long as the (slightly misleadingly named) TO condition holds true.

FOR [ target := init ] TO condition STEP step
   // commands
   // ...
END

target

The incremental counter variable to initialize with the value init (e.g. #i).

init

The value with which to initialize the counter variable target (e.g. 0).

condition

The condition which should be tested at the start of each loop (e.g. $#i < 10). See Conditional Expressions for further information on conditional expressions.

step

The incremental value to add to the counter variable target at the end of each loop. The assignment syntax (e.g. #i := int $#i+1) is allowed.

FOR #i := 0 TO $#i < 10 STEP #i := int $#i+1
    BUTIL MSGBOX MSG; #i = $#i
END

// an example without initialisation
FOR TO $#x > $#y STEP #i := int $#i + 1
   // do something here ...
END