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Bitwise AND is a bit-level operation on two binary values which indicates which bits are set in both values. For each position $i$ , if and only if the bit $d_i$ in both values is 1, then $d_i$ of the result is also 1, othewise, it's 0. For example, given 50 and 163 in two unsigned bytes, a bitwise AND returns 34.
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| AND |
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| = |
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In most high-level programming languages that offer bitwise AND, the usual operator is a single ampersand (&), not to be confused with a double ampersand (&&) which performs a Boolean AND, returning a True or False value.
The Windows Calculator offers bitwise AND in scientific calculator mode, while the Mac OS X Calculator offers it in programmer mode.
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