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Annotation of 43BSDReno/lib/libm/common_source/floor.3, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1985 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)floor.3     6.4 (Berkeley) 5/12/86
        !             6: .\"
        !             7: .TH FLOOR 3M  "May 12, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: fabs, floor, ceil, rint \- absolute value, floor, ceiling, and
        !            11: round-to-nearest functions
        !            12: .SH SYNOPSIS
        !            13: .nf
        !            14: .B #include <math.h>
        !            15: .PP
        !            16: .B double floor(x)
        !            17: .B double x;
        !            18: .PP
        !            19: .B double ceil(x)
        !            20: .B double x;
        !            21: .PP
        !            22: .B double fabs(x)
        !            23: .B double x;
        !            24: .PP
        !            25: .B double rint(x)
        !            26: .B double x;
        !            27: .fi
        !            28: .SH DESCRIPTION
        !            29: Fabs returns the absolute value |\|x\||.
        !            30: .PP
        !            31: Floor returns the largest integer no greater than x.
        !            32: .PP
        !            33: Ceil returns the smallest integer no less than x.
        !            34: .PP
        !            35: Rint returns the integer (represented as a double precision number)
        !            36: nearest x in the direction of the prevailing rounding mode.
        !            37: .SH NOTES
        !            38: On a VAX, rint(x) is equivalent to adding half to the magnitude
        !            39: and then rounding towards zero.
        !            40: .PP
        !            41: In the default rounding mode, to nearest,
        !            42: on a machine that conforms to IEEE 754,
        !            43: rint(x) is the integer nearest x with the additional stipulation
        !            44: that if |rint(x)\-x|=1/2 then rint(x) is even.
        !            45: Other rounding modes can make rint act like floor, or like ceil,
        !            46: or round towards zero.
        !            47: .PP
        !            48: Another way to obtain an integer near x is to declare (in C)
        !            49: .RS
        !            50: double x;\0\0\0\0 int k;\0\0\0\0k\0=\0x;
        !            51: .RE
        !            52: Most C compilers round x towards 0 to get the integer k, but
        !            53: some do otherwise.
        !            54: If in doubt, use floor, ceil, or rint first, whichever you intend.
        !            55: Also note that, if x is larger than k can accommodate, the value of
        !            56: k and the presence or absence of an integer overflow are hard to
        !            57: predict.
        !            58: .SH SEE ALSO
        !            59: abs(3),
        !            60: ieee(3M),
        !            61: math(3M)

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