RAND(3) BSD Library Functions Manual RAND(3)NAME
rand, srand — bad random number generator
These interfaces are obsoleted by random(3).
The rand() function computes a sequence of pseudo-random integers in the
range of 0 to RAND_MAX (as defined by the header file ⟨stdlib.h⟩).
The srand() function sets its argument as the seed for a new sequence of
pseudo-random numbers to be returned by rand(). These sequences are
repeatable by calling srand() with the same seed value.
If no seed value is provided, the functions are automatically seeded with
a value of 1.
The rand() and srand() functions conform to ANSI X3.159-1989
BSD June 4, 1993 BSD