94 lines
2.9 KiB
OpenEdge ABL
94 lines
2.9 KiB
OpenEdge ABL
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65300 #include "rundecs.h"
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65310 (* COPYRIGHT 1983 C.H.LINDSEY, UNIVERSITY OF MANCHESTER *)
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65320 (**)
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65330 PROCEDURE ERRORR(N: INTEGER);EXTERN;
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65340 PROCEDURE GARBAGE(ANOBJECT: OBJECTP);EXTERN;
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65350 FUNCTION SAFEACCESS(LOCATION: OBJECTP): UNDRESSP; EXTERN;
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65360 (**)
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65370 (**)
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65380 FUNCTION RAND(VAR SEED: INTEGER): REAL;
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65390 CONST
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65400 (*+11()
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65410 MULTIPLIER=16777215;
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65420 PRIMEMODULUS=281474976710597;
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65430 (*N=48, L=24, M=24*)
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65440 TWOL=16777216;
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65450 TWOM=16777216;
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65460 PRIMEDIFF=59; (*2^N - PRIMEMODULUS*)
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65470 SHRINKER=4614343880501.61;
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65480 STRETCHER=4614343880502.55;
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65490 ()+11*)
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65500 (*+12()
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65510 MULTIPLIER=176;
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65520 PRIMEMODULUS=32749;
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65530 (*N=15, L=7, M=8*)
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65540 TWOL=128;
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65550 TWOM=256;
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65560 PRIMEDIFF=19; (*2^N - PRIMEMODULUS*)
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65570 SHRINKER=1560.381;
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65580 STRETCHER=1559.381;
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65590 ()+12*)
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65600 (*+13()
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65610 MULTIPLIER=46340;
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65620 PRIMEMODULUS=2147483647;
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65630 (*N=31, L=15, M=16*)
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65640 TWOL=32768;
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65650 TWOM=65536;
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65660 PRIMEDIFF=1; (*2^N - PRIMEMODULUS*)
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65670 SHRINKER=715827882.334;
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65680 STRETCHER=715827881.667;
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65690 ()+13*)
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65700 VAR HIBITS,MIDBITS,LOBITS: INTEGER;
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65710 LSHALFOFRAND: REAL;
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65720 BEGIN
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65730 SEED := SEED+(1-TRUNC(SEED/SHRINKER));
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65740 LSHALFOFRAND := SEED/PRIMEMODULUS;
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65750 LSHALFOFRAND := LSHALFOFRAND/PRIMEMODULUS;
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65760 LOBITS := SEED MOD TWOL * MULTIPLIER;
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65770 MIDBITS := (SEED DIV TWOL - TWOL)*MULTIPLIER + LOBITS DIV TWOL;
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65780 IF MIDBITS>=0 THEN
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65790 BEGIN
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65800 HIBITS := MIDBITS DIV TWOM;
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65810 MIDBITS := MIDBITS MOD TWOM + MULTIPLIER*TWOL;
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65820 END
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65830 ELSE
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65840 BEGIN
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65850 HIBITS := (MIDBITS+1) DIV TWOM -1;
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65860 MIDBITS := MIDBITS MOD TWOM;
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65870 MIDBITS := MIDBITS + ORD(MIDBITS<0)*TWOM + MULTIPLIER*TWOL;
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65880 (*IN CASE PASCAL COMPILER DOES NOT IMPLEMENT MOD CORRECTLY*)
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65890 END;
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65900 HIBITS := HIBITS + MIDBITS DIV TWOM;
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65910 MIDBITS := MIDBITS MOD TWOM;
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65920 LOBITS := LOBITS MOD TWOL + MIDBITS*TWOL;
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65930 SEED := LOBITS - PRIMEMODULUS + HIBITS*PRIMEDIFF;
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65940 IF SEED<0 THEN SEED := SEED + PRIMEMODULUS;
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65950 RAND := SEED/PRIMEMODULUS+LSHALFOFRAND;
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65960 SEED := SEED+TRUNC((SEED-1)/STRETCHER)-1
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65970 END;
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65980 (**)
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65990 (**)
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66000 FUNCTION RANDOM: REAL;
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66010 BEGIN
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66020 RANDOM := RAND(LASTRANDOM)
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66030 END;
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66040 (**)
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66050 (**)
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66060 FUNCTION NEXTRAN(SEEDP: OBJECTP): REAL;
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66070 VAR PTR: UNDRESSP;
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66080 BEGIN
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66090 PTR := SAFEACCESS(SEEDP);
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66100 NEXTRAN := RAND(PTR^.FIRSTWORD);
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66110 IF FPTST(SEEDP^) THEN GARBAGE(SEEDP);
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66120 END;
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66130 (**)
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66140 (**)
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66150 (*-02()
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66160 BEGIN (* OF A68 *)
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66170 END (* OF A68 *);
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66180 ()-02*)
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66190 (*+01()
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66200 BEGIN (* OF MAIN PROGRAM *)
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66210 END (* OF MAIN PROGRAM *).
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66220 ()+01*)
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