88 lines
1.6 KiB
C++
88 lines
1.6 KiB
C++
|
#include <stdio.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <iostream.h>
|
||
|
|
#include "krand.h"
|
||
|
|
|
||
|
|
#include <time.h>
|
||
|
|
|
||
|
|
#define MBIG 1000000000L
|
||
|
|
#define MSEED 161803398L
|
||
|
|
#define FAC (1.0 / MBIG)
|
||
|
|
|
||
|
|
static int inext;
|
||
|
|
static int inextp;
|
||
|
|
static long ma[56];
|
||
|
|
|
||
|
|
double knuth_random(void) {
|
||
|
|
long mj;
|
||
|
|
if (++inext == 56) inext = 1;
|
||
|
|
if (++inextp == 56) inextp = 1;
|
||
|
|
mj = ma[inext] - ma[inextp];
|
||
|
|
if (mj < 0) mj += MBIG;
|
||
|
|
ma[inext] = mj;
|
||
|
|
return mj * FAC;
|
||
|
|
}
|
||
|
|
|
||
|
|
long seed_random(long seed) {
|
||
|
|
long mj, mk;
|
||
|
|
register int i, k;
|
||
|
|
|
||
|
|
if (seed < 0) {
|
||
|
|
time_t tp;
|
||
|
|
seed = time(&tp);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (seed >= MBIG) {
|
||
|
|
cerr<<"Seed value too big (> "<<MBIG<<") in knuth_srand().";
|
||
|
|
exit(1);
|
||
|
|
}
|
||
|
|
|
||
|
|
ma[55] = mj = seed;
|
||
|
|
mk = 1;
|
||
|
|
|
||
|
|
for (i = 1; i <= 54; i++) {
|
||
|
|
register int ii = (21 * i) % 55;
|
||
|
|
ma[ii] = mk;
|
||
|
|
mk = mj - mk;
|
||
|
|
if (mk < 0) mk += MBIG;
|
||
|
|
mj = ma[ii];
|
||
|
|
}
|
||
|
|
|
||
|
|
for (k = 0; k < 4; k++) {
|
||
|
|
for (i = 1; i <= 55; i++) {
|
||
|
|
ma[i] -= ma[1 + (i + 30) % 55];
|
||
|
|
if (ma[i] < 0) ma[i] += MBIG;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
inext = 0;
|
||
|
|
inextp = 31;
|
||
|
|
|
||
|
|
return seed;
|
||
|
|
}
|
||
|
|
|
||
|
|
int krandom(int max) {
|
||
|
|
int retval = (int)(knuth_random() * max);
|
||
|
|
if (retval < 0 || retval >= max) {
|
||
|
|
cout<<"ERROR: random num generator out of bounds!"<<endl;
|
||
|
|
exit(-1);
|
||
|
|
}
|
||
|
|
return retval;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*
|
||
|
|
//for testing
|
||
|
|
void main(void) {
|
||
|
|
seed_random(100);
|
||
|
|
for (int i = 0; i < 24; i++) cout<<i<<" "<<knuth_random()<<" "<<krandom(100)<<endl;
|
||
|
|
cin.get();
|
||
|
|
seed_random(200);
|
||
|
|
for (i = 0; i < 24; i++) cout<<i<<" "<<knuth_random()<<" "<<krandom(100)<<endl;
|
||
|
|
cin.get();
|
||
|
|
seed_random(100);
|
||
|
|
for (i = 0; i < 24; i++) cout<<i<<" "<<knuth_random()<<" "<<krandom(100)<<endl;
|
||
|
|
cin.get();
|
||
|
|
}
|
||
|
|
*/
|