/*- * Copyright (c) 1980 The Regents of the University of California. * All rights reserved. * * This module is believed to contain source code proprietary to AT&T. * Use and redistribution is subject to the Berkeley Software License * Agreement and your Software Agreement with AT&T (Western Electric). */ #ifndef lint static char sccsid[] = "@(#)random_.c 5.5 (Berkeley) 4/12/91"; #endif /* not lint */ /* * Routines to return random values * * calling sequence: * double precision d, drandm * i = irandm(iflag) * x = random(iflag) * d = drandm(iflag) * where: * If arg is nonzero, generator is restarted and value is returned. * If arg is 0, next value is returned. * Integer values will range from 0 thru 2147483647 (see random(3)). * Real values will range from 0.0 thru 1.0 . */ #if defined(vax) || defined(tahoe) || defined(hp300) #define RANDMAX 2147483647 #else vax || tahoe UNKNOWN MACHINE! #endif vax || tahoe long irandm_(iarg) long *iarg; { if (*iarg) srandom((int)*iarg); return( random() ); } float random_(iarg) long *iarg; { if (*iarg) srandom((int)*iarg); return( (float)(random())/(float)RANDMAX ); } double drandm_(iarg) long *iarg; { if (*iarg) srandom((int)*iarg); return( (double)(random())/(double)RANDMAX ); }