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Last change
on this file since 116 was 2, checked in by Dmitry A. Kuminov, 16 years ago |
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Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
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File size:
837 bytes
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| 1 | /* lran2.h
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| 2 | * by Wolfram Gloger 1996.
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| 3 | *
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| 4 | * A small, portable pseudo-random number generator.
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| 5 | */
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| 6 |
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| 7 | #ifndef _LRAN2_H
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| 8 | #define _LRAN2_H
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| 9 |
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| 10 | #define LRAN2_MAX 714025l /* constants for portable */
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| 11 | #define IA 1366l /* random number generator */
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| 12 | #define IC 150889l /* (see e.g. `Numerical Recipes') */
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| 13 |
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| 14 | struct lran2_st {
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| 15 | long x, y, v[97];
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| 16 | };
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| 17 |
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| 18 | static void
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| 19 | lran2_init(struct lran2_st* d, long seed)
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| 20 | {
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| 21 | long x;
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| 22 | int j;
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| 23 |
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| 24 | x = (IC - seed) % LRAN2_MAX;
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| 25 | if(x < 0) x = -x;
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| 26 | for(j=0; j<97; j++) {
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| 27 | x = (IA*x + IC) % LRAN2_MAX;
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| 28 | d->v[j] = x;
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| 29 | }
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| 30 | d->x = (IA*x + IC) % LRAN2_MAX;
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| 31 | d->y = d->x;
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| 32 | }
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| 33 |
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| 34 | #ifdef __GNUC__
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| 35 | __inline__
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| 36 | #endif
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| 37 | static long
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| 38 | lran2(struct lran2_st* d)
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| 39 | {
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| 40 | int j = (d->y % 97);
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| 41 |
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| 42 | d->y = d->v[j];
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| 43 | d->x = (IA*d->x + IC) % LRAN2_MAX;
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| 44 | d->v[j] = d->x;
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| 45 | return d->y;
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| 46 | }
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| 47 |
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| 48 | #undef IA
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| 49 | #undef IC
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| 50 |
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| 51 | #endif
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