1 /* 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. 5 * 6 * @(#)random_.c 5.3 10/30/86 7 * 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 defined(vax) || defined(tahoe) 23 #define RANDMAX 2147483647 24 #else vax || tahoe 25 UNKNOWN MACHINE! 26 #endif vax || tahoe 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 } 48