Setting last N bits in an array

Posted by Martin on Stack Overflow See other posts from Stack Overflow or by Martin
Published on 2010-04-21T23:18:11Z Indexed on 2010/04/21 23:23 UTC
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I'm sure this is fairly simple, however I have a major mental block on it, so I need a little help here!

I have an array of 5 integers, the array is already filled with some data. I want to set the last N bits of the array to be random noise.

[int][int][int][int][int]

set last 40 bits

[unchanged][unchanged][unchanged][24 bits of old data followed 8 bits of randomness][all random]

This is largely language agnostic, but I'm working in C# so bonus points for answers in C#

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