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Annotation of 43BSDReno/lib/libF77/rand_.c, revision 1.1.1.1

1.1       root        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:  *     @(#)rand_.c     5.4     5/13/90
                      7:  *
                      8:  * Routines to return random values
                      9:  *
                     10:  * calling sequence:
                     11:  *     double precision d, drand
                     12:  *     i = irand(iflag)
                     13:  *     x = rand(iflag)
                     14:  *     d = drand(iflag)
                     15:  * where:
                     16:  *     If arg is 1, generator is restarted. If arg is 0, next value
                     17:  *     is returned. Any other arg is a new seed for the generator.
                     18:  *     Integer values will range from 0 thru 2147483647.
                     19:  *     Real values will range from 0.0 thru 1.0
                     20:  *     (see rand(3))
                     21:  */
                     22: 
                     23: #if    defined(vax) || defined(tahoe) || defined(hp300)
                     24: #define        RANDMAX         2147483647
                     25: #else  vax || tahoe
                     26: #if    pdp11
                     27: #define        RANDMAX         32767
                     28: #else  pdp11
                     29:        UNKNOWN MACHINE!
                     30: #endif pdp11
                     31: #endif vax || tahoe
                     32: 
                     33: long irand_(iarg)
                     34: long *iarg;
                     35: {
                     36:        if (*iarg) srand((int)*iarg);
                     37: #if    pdp11
                     38:        return(( ((long)rand()) << 16) | rand());
                     39: #else  pdp11
                     40:        return( rand() );
                     41: #endif pdp11
                     42: }
                     43: 
                     44: float rand_(iarg)
                     45: long *iarg;
                     46: {
                     47:        if (*iarg) srand((int)*iarg);
                     48:        return( (float)(rand())/(float)RANDMAX );
                     49: }
                     50: 
                     51: double drand_(iarg)
                     52: long *iarg;
                     53: {
                     54:        if (*iarg) srand((int)*iarg);
                     55:        return( (double)(rand())/(double)RANDMAX );
                     56: }

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