====== IF/THEN/ELSE ======

===== Syntax =====

<code basic>
IF value THEN line1 [ELSE line2]
</code>

===== Description =====

Single line standard IF command.  If the value is non-zero, then branh to line1.  If the
value is zero and ELSE is provided, then branch to line2.  Otherwise continue to the
next line.  LABELS are not allowed.