71 lines
1.6 KiB
C++
71 lines
1.6 KiB
C++
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#include <string.h>
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#include <math.h>
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#include <stdlib.h>
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#include "random.h"
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#define PCRAND
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#ifdef PCRAND
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#define RANDOM_MAX RAND_MAX
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#else
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#define RANDOM_MAX pow(2, 31)-1
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#endif
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/* this random function returns 1 if a random toss is within pfactor, 0<pfactor<1*/
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int Probability(float pfactor)
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{
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return (pfactor>Random1());
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/* if a random value from 0 to 1 is less than pfactor, return true*/
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}
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/* -----------------------------------------------------------------------------------------------------------------*/
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unsigned Random(unsigned num) /* returns a random word between 0 and num-1*/
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{
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float ratio, temp;
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ratio=num;
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temp=RANDOM_MAX;
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ratio=ratio/temp;
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#ifdef PCRAND
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temp=rand();
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#else
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temp=random();
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#endif
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if (temp*ratio>num-1) return num-1;
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else return (temp*ratio);
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}
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/* ------------------------------------------------------------------------------------------------------------*/
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/* returns a value between 0 and 1*/
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float Random1(void)
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{
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float ratio,temp;
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#ifdef PCRAND
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ratio=rand();
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#else
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ratio=random();
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#endif
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temp=RANDOM_MAX;
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ratio=ratio/temp;
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if (ratio<=0) ratio=0.0001;
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if (ratio>=0.9999) ratio=0.9999;
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return ratio;
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}
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/* -------------------------------------------------------------------------------------------------------------------*/
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/* initializes random generator*/
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void InitRandom(int seed)
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{
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#ifdef PCRAND
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srand(seed);
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#else
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static char state[64];
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initstate(seed,state,64);
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setstate(state);
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#endif
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}
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