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Annotation of 43BSD/usr.lib/libF77/rand_.c, revision 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     5.2     6/7/85
        !             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    vax
        !            24: #define        RANDMAX         2147483647
        !            25: #else  vax
        !            26: #if    pdp11
        !            27: #define        RANDMAX         32767
        !            28: #else  pdp11
        !            29:        UNKNOWN MACHINE!
        !            30: #endif pdp11
        !            31: #endif vax
        !            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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