projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| da3b1b0b | 1 | /* |
| be6e3ddf RE |
2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| da3b1b0b | 5 | * |
| eda8efe9 RE |
6 | * @(#)random_.c 5.2 %G% |
| 7 | * | |
| da3b1b0b RC |
8 | * Routines to return random values |
| 9 | * | |
| 10 | * calling sequence: | |
| 11 | * double precision d, drandm | |
| 12 | * i = irandm(iflag) | |
| 13 | * x = random(iflag) | |
| 14 | * d = drandm(iflag) | |
| 15 | * where: | |
| 16 | * If arg is nonzero, generator is restarted and value is returned. | |
| 17 | * If arg is 0, next value is returned. | |
| 18 | * Integer values will range from 0 thru 2147483647 (see random(3)). | |
| 19 | * Real values will range from 0.0 thru 1.0 . | |
| 20 | */ | |
| 21 | ||
| 22 | #if vax | |
| 23 | #define RANDMAX 2147483647 | |
| 24 | #else vax | |
| 25 | UNKNOWN MACHINE! | |
| 26 | #endif vax | |
| 27 | ||
| 28 | long irandm_(iarg) | |
| 29 | long *iarg; | |
| 30 | { | |
| 31 | if (*iarg) srandom((int)*iarg); | |
| 32 | return( random() ); | |
| 33 | } | |
| 34 | ||
| 35 | float random_(iarg) | |
| 36 | long *iarg; | |
| 37 | { | |
| 38 | if (*iarg) srandom((int)*iarg); | |
| 39 | return( (float)(random())/(float)RANDMAX ); | |
| 40 | } | |
| 41 | ||
| 42 | double drandm_(iarg) | |
| 43 | long *iarg; | |
| 44 | { | |
| 45 | if (*iarg) srandom((int)*iarg); | |
| 46 | return( (double)(random())/(double)RANDMAX ); | |
| 47 | } |