PLOGHELP PLUS Kathryn Seifert October 1986
Operator to add two numbers together
?- X is + .
Keywords: addition, arithmetic expressions, arithmetic, evaluation
To add two numbers together, use the plus sign, with the operator "is":
?- X is 2 + 1.
X = 3 ?
-- RELATED DOCUMENTATION -----------------------------------------------
PLOGHELP * ARITHMETIC
Overview of HELP files dealing with operations on numbers.
PLOGHELP * IS
Evaluating POP-11 and arithmetic expressions which return one result
PLOGHELP * SYMBOLS
Summary and index of HELP files for symbols used in Prolog
PLOGHELP * OPERATORS
Operator declarations made when the Prolog system is loaded
PLOGHELP * OP
How to declare operators