Category : C Source Code
Archive   : CSRC2.ZIP
Filename : IRAND.C

 
Output of file : IRAND.C contained in archive : CSRC2.ZIP
/*
* i r a n d . c
*/

/*)LIBRARY
*/

#ifdef DOCUMENTATION

title irand Random number modulus argument
index Random number generator

synopsis
.s.nf
int
irand(arg)
int arg;
Description

Generate a pseudorandom number in the range 0 .. (arg-1).
If arg is zero, generate a number in the range 0 .. 32767.

Note that the algorithm is prone to nonrandom sequences when
considering the next pseudorandom number.

irand is equivalent to the following sequence:

extern long rand;

if (arg == 0) arg = 32767;
return(((rand() >> 8) & 32767) % arg);

Bugs

#endif

int
irand(max)
register int max;
/*
* Rand with modulus
*/
{
register int temp;
extern long rand();

temp = rand() >> 8;
temp &= 32767;
return ((max == 0) ? max : temp % max);
}


  3 Responses to “Category : C Source Code
Archive   : CSRC2.ZIP
Filename : IRAND.C

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/