DEC VAR

 Function
  Decrement the value of a variable specified by VAR.

 Syntax
  DEC var
   var  The variable with the value to decrement.

 Remarks
  Many programs require extensive addition and subtraction, and most
  often, a value is increased or decreased by 1.  This statement allows for
  a shorter, more efficient method of decreasing (decrementing) a value
  by 1 than subtracting 1 from a variable and assigning the result to the
  same variable.

 Examples
  INTEGER i
  PRINTLN "Countdown:"
  LET i = 10
  WHILE (i >= 0) DO
   PRINTLN "T minus ",i
   DEC i
  ENDWHILE