**Q:**
I need a random true/false value,
so I'm just taking `rand() % 2`,
but it's alternating 0, 1, 0, 1, 0...

**A:**
Poor
pseudorandom number generators
(such as the ones
unfortunately supplied with some
systems)
are not very random in
the low-order bits.
(In fact,
for a
pure
linear congruential random number generator
with period
2**e,
and this tends to be how random number generators for e-bit
machines
are written,
the low-order n bits repeat with period
2**n.)
For this reason,
it's preferable to use
the higher-order bits:
see question
13.16.

References:
Knuth Sec. 3.2.1.1 pp. 12-14

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