Conditional Instructions

conditional-instruction = action-instruction when condition
action-instruction = 
  assignment |  procedure call | input | output | loop exit | 
  return from call to procedure | return from call to function

A conditional instruction is carried out only when the condition is True. In other words

  x +:= 1 when x > 0

is another way of writing

  if x > 0
    x +:= 1
  end

Herman Venter

This is Slim documentation as snarfed on 27 May 1999 by dB.