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pfigue/bin2dec.erl

Created November 15, 2011 21:25
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From binary to decimal, in erlang
Raw
bin2dec.erl
-module(bin2dec).
-export([bin2dec/1, bin2dec_/2]).
bin2dec("") ->
0;
bin2dec(List) -> bin2dec_(List, 0).
bin2dec_([], Sum) ->
Sum;
bin2dec_([48 | Tail], Sum) -> %48 is ascii code for 0
bin2dec_(Tail, Sum * 2);
bin2dec_([49 | Tail], Sum) -> %49 is ascii code for 1
bin2dec_(Tail, Sum * 2 + 1).
%% Example:
%% $ erl
%% [...]
%% 55> c(bin2dec).
%% {ok,bin2dec}
%% 57> bin2dec:bin2dec("110").
%% 6
%% 58> bin2dec:bin2dec("100").
%% 4
@tejaskane
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can you explain the code?

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