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fa555e1b36
Estimatd hours taken: 0.5 Branches: main samples/*.m: Use '.' as the module qualifier instead of '__'. Use the new foreign language interface. Fix minor formatting issues. Use state variables for passing the I/O state.
28 lines
581 B
Mathematica
28 lines
581 B
Mathematica
% This is a simple example of using the C interface to call the C function
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% (or macro) puts().
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% This source file is hereby placed in the public domain. -fjh (the author).
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:- module short_example.
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:- interface.
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:- import_module io.
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:- pred main(io::di, io::uo) is det.
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:- implementation.
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:- pred puts(string::in, io::di, io::uo) is det.
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:- pragma foreign_decl("C", "#include <stdio.h>").
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:- pragma foreign_proc("C",
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puts(S::in, Old_IO::di, New_IO::uo),
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[promise_pure, will_not_call_mercury],
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"
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puts(S);
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New_IO = Old_IO;
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").
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main(!IO) :-
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puts("Hello, world\n", !IO).
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