19 lines
565 B
Prolog
19 lines
565 B
Prolog
:- use_module(library(os)).
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:- use_module(library(ffi)).
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test :-
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read(Body),
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term_variables(Body, [LIB]),
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Body,
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use_foreign_module(LIB, ['ffi_f64_minus_zero'([], f64), 'signum'([f64], f64)]),
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ffi:'ffi_f64_minus_zero'(N),
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A is max(0.0, N),
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B is max(N, 0.0),
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ffi:'signum'(A, SA),
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ffi:'signum'(B, SB),
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write((SA, SB)),
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-1.0 is SA, % incorrect, based on https://www.swi-prolog.org/pldoc/man?function=max/2 -0.0 is less than 0.0 so A and B should be 0.0 for which signum should be 1
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1.0 is SB.
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:- initialization(test).
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