31 lines
769 B
Text
31 lines
769 B
Text
:- module fizzbuzz.
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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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:- import_module int, string, bool.
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:- func fizz(int) = bool.
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fizz(N) = ( if N mod 3 = 0 then yes else no ).
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:- func buzz(int) = bool.
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buzz(N) = ( if N mod 5 = 0 then yes else no ).
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% N 3? 5?
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:- func fizzbuzz(int, bool, bool) = string.
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fizzbuzz(_, yes, yes) = "FizzBuzz".
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fizzbuzz(_, yes, no) = "Fizz".
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fizzbuzz(_, no, yes) = "Buzz".
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fizzbuzz(N, no, no) = from_int(N).
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main(!IO) :- main(1, 100, !IO).
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:- pred main(int::in, int::in, io::di, io::uo) is det.
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main(N, To, !IO) :-
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io.write_string(fizzbuzz(N, fizz(N), buzz(N)), !IO),
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io.nl(!IO),
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( if N < To then
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main(N + 1, To, !IO)
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else
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true
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).
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