2.11BSD#431 - /usr/src/new/OLD/apl/src/af.c

   1: static char Sccsid[] = "af.c @(#)af.c	1.1	10/1/82 Berkeley ";
   2: #include "apl.h"
   3: 
   4: #ifdef vax
   5: #define MAXRAND 2147483648.
   6: #else
   7: #define MAXRAND 32768.
   8: #endif
   9: 
  10: ex_deal()
  11: {
  12:     register struct item *p;
  13:     register m, n;
  14:     double f;
  15:     data d1, d2;
  16: 
  17:     m = topfix();
  18:     n = topfix();
  19:     if(m < 0 || m > n)
  20:         error("deal D");
  21:     p = newdat(DA, 1, m);
  22:     datum = thread.iorg;
  23:     for(; n!=0; n--) {
  24:         f = m;
  25:         f /= n;
  26:         if(rand()/MAXRAND < f) {
  27:             putdat(p, datum);
  28:             m--;
  29:         }
  30:         datum += one;
  31:     }
  32:     m = p->size;
  33:     while(m > 0) {
  34:         f = rand()/MAXRAND;
  35:         n = m * f;
  36:         m--;
  37:         if(n != m) {
  38:             p->index = n;
  39:             d1 = getdat(p);
  40:             p->index = m;
  41:             d2 = getdat(p);
  42:             p->index = n;
  43:             putdat(p, d2);
  44:             p->index = m;
  45:             putdat(p, d1);
  46:         }
  47:     }
  48:     *sp++ = p;
  49: }
  50: 
  51: data
  52: ex_rand(d)
  53: data d;
  54: {
  55:     double f;
  56: 
  57:     f = (rand()/MAXRAND) * d;
  58:     d = floor(f) + thread.iorg;
  59:     return(d);
  60: }

Defined functions

Defined variables

Defined macros