52 lines
1020 B
C++
52 lines
1020 B
C++
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/* Random numbers */
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/* Copyright (c) Mix Software 1988 */
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/* ------------------------------------------------------------ */
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double drand(n)
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int n;
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{
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extern double (far *$0DFIXR)();
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double d;
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d = (double) rand() / (double) 0x7FFF;
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if (n == 0) return d;
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return $0DFIXR(d * n);
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}
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/* ------------------------------------------------------------ */
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rand()
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{
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extern long _seed;
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_seed = _seed * 15790321;
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return (int) ((_seed >> 17) & 0x7FFF);
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}
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/* ------------------------------------------------------------ */
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void srand(seed)
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unsigned seed;
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{
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extern long _seed;
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union REGS r;
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union {
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long lval;
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struct {
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unsigned lsword;
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unsigned msword;
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} words;
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} val;
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if (seed == 1) _seed = 13849l;
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else {
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r.x.ax = 0x2c00;
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intdos(&r,&r);
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val.words.lsword = r.x.dx;
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val.words.msword = r.x.cx;
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_seed = val.lval;
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}
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}
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long _seed = 13849;
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