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da0e9ce3 | 1 | //-------------------------------------------------------------------------- |
2 | // | |
3 | // Environment: | |
4 | // This software is part of the EvtGen package developed jointly | |
5 | // for the BaBar and CLEO collaborations. If you use all or part | |
6 | // of it, please give an appropriate acknowledgement. | |
7 | // | |
8 | // Copyright Information: See EvtGen/COPYRIGHT | |
9 | // Copyright (C) 1998 Caltech, UCSB | |
10 | // | |
11 | // Module: EvtRandomEngine.cc | |
12 | // | |
13 | // Description: routines to generate random numbers | |
14 | // really trivial random number | |
15 | // implementation. | |
16 | // | |
17 | // Modification history: | |
18 | // | |
19 | // RYD December 25, 1999 Module created | |
20 | // | |
21 | //------------------------------------------------------------------------ | |
22 | // | |
23 | #include "EvtGenBase/EvtPatches.hh" | |
24 | ||
25 | ||
26 | #include <stdio.h> | |
27 | #include <math.h> | |
28 | #include <iostream> | |
29 | #include "EvtGenBase/EvtSimpleRandomEngine.hh" | |
30 | ||
31 | double EvtSimpleRandomEngine::random(){ | |
32 | ||
33 | _next=_next*1103515245+123345; | |
34 | unsigned temp=(unsigned)(_next/65536) % 32768; | |
35 | ||
36 | return ( temp + 1.0 ) / 32769.0; | |
37 | ||
38 | } | |
39 | ||
40 | ||
41 |