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assert/1,asserta/1,assertz/1

assert(Fact)
asserta
(Fact)
assertz(Fact)

Insert a fact in the internal database.

Remarks

asserta/1 inserts a Fact in the internal database before any other stored facts for the corresponding predicate.

assert/1 and assertz/1 insert a Fact in the internal database after any other stored facts for the corresponding predicate.

Example

asserta(person("Leo", 31, "",2605)),
asserta(person("Per", 29, "",2605)),
assertz(person("Michael", 36,"", 30318)),
asserta(city(2605, "Br˘ndby,Copenhagen")),
assertz(city(30318, "Atlanta")).