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There are four other, occasionally useful, bitwise operators. The
bitwise-complement operator, ~, converts 1s to 0s,
and vice versa. Thus, if a certain mask, m, allows passage of bits
0 and 3, then ~m allows passage of all bits except bits 0 and 3:
m
*-*-*-*-*-*-*-*-*
|0|0|0|0|1|0|0|1| ----*
*-*-*-*-*-*-*-*-* |
v Action of bitwise-complement operator
*-*-*-*-*-*-*-*-* |
|1|1|1|1|0|1|1|0| <---*
*-*-*-*-*-*-*-*-*