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Annotation of researchv10dc/man/adm/man3/rand.3, revision 1.1

1.1     ! root        1: .TH RAND 3
        !             2: .CT 2 math
        !             3: .SH NAME
        !             4: rand, lrand, frand, nrand, srand \(mi random number generator
        !             5: .SH SYNOPSIS
        !             6: .nf
        !             7: .B int rand()
        !             8: .PP
        !             9: .B long lrand()
        !            10: .PP
        !            11: .B double frand()
        !            12: .PP
        !            13: .B int nrand(val)
        !            14: .B int val;
        !            15: .PP
        !            16: .B srand(seed)
        !            17: .B int seed;
        !            18: .fi
        !            19: .SH DESCRIPTION
        !            20: .I Rand
        !            21: uses a linear feedback
        !            22: random number generator
        !            23: to return uniform pseudo-random
        !            24: numbers
        !            25: .I x,
        !            26: .if t .RI 0\(<= x <2\u\s715\s10\d,
        !            27: .if n 0<=x<2^15,
        !            28: with period about
        !            29: .if t 2\u\s732\s0\d.
        !            30: .if n 2^32.
        !            31: .PP
        !            32: .I Lrand
        !            33: returns a uniform long
        !            34: .I x,
        !            35: .if t .RI 0\(<= x <2\u\s731\s10\d,
        !            36: .if n 0<=x<2^31,
        !            37: with period about
        !            38: .if t 2\u\s748\s0\d.
        !            39: .if n 2^48.
        !            40: .PP
        !            41: .I Frand
        !            42: returns a uniform double
        !            43: .I x,
        !            44: .if t .RI 0.0\(<= x <1.0,
        !            45: .if n 0.0<=x<1.0,
        !            46: always a multiple of
        !            47: .if t 2\u\s7\-31\s0\d.
        !            48: .if n 2^-31.
        !            49: .PP
        !            50: .I Nrand
        !            51: returns a uniform integer
        !            52: .I x,
        !            53: .if t .RI 0\(<= x < val.
        !            54: .if n 0<=x<val.
        !            55: .PP
        !            56: The generators are initialized by calling
        !            57: .I srand
        !            58: with whatever you like as argument.
        !            59: To get a different starting value each time,
        !            60: .IP
        !            61: .L
        !            62: srand((int)time((long *)0));
        !            63: .LP
        !            64: will work as long as it is not called more often
        !            65: than once per second.
        !            66: .SH BUGS
        !            67: .I Rand
        !            68: and
        !            69: .I lrand
        !            70: are quite machine-dependent.
        !            71: Although
        !            72: .I frand
        !            73: and
        !            74: .I nrand
        !            75: are more portable, they appear in few versions of Unix.

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