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28 lines
626 B
Erlang
28 lines
626 B
Erlang
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% Add all the natural numbers below one thousand that are multiples of 3 or 5.
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% If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
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% Find the sum of all the multiples of 3 or 5 below 1000.
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-module(e001).
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-export([
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main/1
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]).
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sum(3) ->
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0;
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sum(Max) ->
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N = Max - 1,
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if
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N rem 3 == 0 ->
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A = N;
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N rem 5 == 0 ->
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A = N;
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true ->
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A = 0
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end,
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sum(N) + A.
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main(_) ->
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io:format("Sum of < 10: ~w~n", [sum(10)]),
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io:format("Sum of < 1000: ~w~n", [sum(1000)]).
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