Return to rand_.c CVS log

Up to [CSRG BSD Unix] / 42BSD / usr.lib / libF77

Annotation of 42BSD/usr.lib/libF77/rand_.c, revision 1.1

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

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.