I need a random true/false value, so I'm just taking rand() % 2, but it's alternating 0, 1, 0, 1, 0...
Poor pseudorandom number generators (such as the ones unfortunately supplied with some systems) are not very random in the low-order bits. Try using the higher-order bits: see question 13.16.
References:
Knuth Sec. 3.2.1.1 pp. 12-14
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