47 lines
636 B
Plaintext
47 lines
636 B
Plaintext
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=================================================================
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Logtalk - Object oriented extension to Prolog
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Release 2.16.0
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Copyright (c) 1998-2004 Paulo Moura. All Rights Reserved.
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=================================================================
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% operators declared inside an object are not visible outside:
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| ?- double::(I double J).
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Syntax error: Operator expected
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% you must use instead:
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| ?- double::double(I, J).
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I = 1
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J = 2 ;
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I = 2
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J = 4 ;
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I = 3
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J = 6
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Yes
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% operators also affect inputing of terms, enabling this example to work:
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| ?- triple::triple(I, J).
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I = 1
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J = 3 ;
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I = 2
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J = 6 ;
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I = 3
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J = 9
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Yes
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