Syntax:
if <expression1> then <expression2> [else <expression3>]If else is omitted, then if the expression1 yields
false
or 0, NULL is returned.
Examples:
if(a==5)then(a=a-1) if b<a then b=a if c>0 then c=c-1 else c=0 a = ( if b>0 then b else 1 )Note that = will be translated to == if used inside the expression for if, so
if a=5 then a=a-1will be interpreted as:
if a==5 then a:=a-1