[erlang-questions] checksum calculation
Mon Apr 6 01:09:40 CEST 2009
You could call your checksum/2 function with zero for the
accumulator but the conventional way is to export a checksum/1
function and just use checksum/2 internally. Put a clause head
first which matches the empty input binary.
checksum( <<>>, Csum) ->
checksum( <<N,Rest>>, Csum) ->
checksum(Rest, Csum bxor N).
On Mon, Apr 06, 2009 at 12:29:12AM +0100, Gamoto wrote:
} I have a string of bytes and would like to compute the
} checksum which is the xor of all bytes.
} Let S the string, N the current byte
} checksum( <<N,Rest>>,Csum) ->
} checksum(Rest,Csum bxor N);
} The problems are: I don't know how to start (checksum(<<S>>) ???) and how to finish !
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