10 Mar 2005
CS 3243 - FOL and Prolog
36
Examples of operator
properties
Prolog has
shortcuts in notation for certain operators (especially arithmetic ones)
Position Operator Syntax Normal Syntax
Prefix: -2 -(2)
Infix: 5+17 +(17,5)
Associativity:
left, right, none.
X+Y+Z is parsed as (X+Y)+Z
because addition
is left-associative.
Precedence: an
integer.
X+Y*Z is parsed as X+(Y*Z)
because
multiplication has higher precedence.
These are all the same as the
normal rules of arithmetic.