rand, srand - simple random number generator
rand() uses a multiplicative congruential random number generator with
period 2**32 to return successive pseudo-random numbers in the range
from 0 to (2**31)-1.
srand() can be called at any time to reset the random-number generator
to a random starting point. The generator is initially seeded with a
value of 1.
SYSTEM V DESCRIPTION
rand() returns successive pseudo-random numbers in the range from 0 to
The spectral properties of rand() leave a great deal to be desired.
drand48(3) and random(3) provide much better, though more elaborate,
The low bits of the numbers generated are not very random; use the mid-
dle bits. In particular the lowest bit alternates between 0 and 1.
6 October 1989 RAND(3V)