Re: A89: Random Number generator in C

To: <assembly-89@lists.ticalc.org>
Subject: Re: A89: Random Number generator in C
From: "Zeljko Juric" <zjuric@utic.net.ba>
Date: Sun, 23 Apr 2000 08:28:30 +0200
Reply-To: assembly-89@lists.ticalc.org


Here is one set of routines which are not bad, adapted from
"Learning to program in C" by Thomas Plum (they require
linking with longmul.o):

static long __seed = 1;

int rand(void)  // Returns random number in range 0-32767
{
  return ((__seed=0x41c64e6d*__seed+0x3039)>>8)&0x7FFF;
}

#define random(x) ((int)((long)(unsigned)rand()*(unsigned)(x)/32768))
// Returns random number in range 0 - x

#define srand(x) ((void)(__seed = (x)))
// Sets the seed for random number generator

#define randomize() ({if(__seed==1) srand(*(char*)0x600017);})
// Initializes seed randomly, as I used in my programs

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