42 lines
881 B
Plaintext
42 lines
881 B
Plaintext
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/*
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**********************************************************************
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*
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* CLP(R) Version 2.0 (Example Programs Release)
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* (C) Copyright, March 1986, Monash University
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*
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**********************************************************************
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*/
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%
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% The rule below describes the relationship between two complex numbers
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% and their product. The goal ?- go uses the rule
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% first to multiply two complex numbers, and then to divide one by another,
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% in two different ways.
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%
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zmul(c(R1,I1),c(R2,I2),c(R3,I3)) :-
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R3 = R1 * R2 - I1 * I2 ,
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I3 = R1 * I2 + R2 * I1 .
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go :- zmul(c(1,1),c(2,2),Z),
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zmul(c(1,1),Y,c(0,4)),
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zmul(X,c(2,2),c(0,4)),
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nl,
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write(" X = "),
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write(X),
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nl,
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write(" Y = "),
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write(Y),
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nl,
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write(" Z = "),
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write(Z),
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nl.
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% Answer:
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% X = c(1, 1)
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% Y = c(2, 2)
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% Z = c(0, 4)
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?- printf("\n>>> Sample goal: go/0\n", []).
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