RAND(3)                                                   RAND(3)

     NAME
          rand, lrand, frand, nrand, srand - random number generator

     SYNOPSIS
          int rand( )

          long lrand( )

          double frand( )

          int nrand(val)
          int val;

          srand(seed)
          int seed;

     DESCRIPTION
          Rand uses a polynominal feedback random number generator
          with period 2^49-2^32 to return successive uniform pseudo-
          random numbers x, 0<=x<2^15.

          Lrand returns a uniform long x, 0<=x<2^31.

          Frand returns a uniform double x, 0.0<=x<1.0.

          Nrand returns a uniform integer x, 0<=x<val.

          The generators are initialized by calling srand with what-
          ever you like as argument.  To get a different starting
          value each time,

               srand((int)time(0))

          should work as long as it is not called more often than once
          per second.

     BUGS
          Rand and lrand are quite machine-dependent.  In principle
          frand and nrand are more portable, but only the Eighth Edi-
          tion has them.