1FLOOR(3M)                                                            FLOOR(3M)
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NAME

6       fabs, floor, ceil, rint - absolute value, floor, ceiling, and round-to-
7       nearest functions
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SYNOPSIS

10       #include <math.h>
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12       double floor(x)
13       double x;
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15       double ceil(x)
16       double x;
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18       double fabs(x)
19       double x;
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21       double rint(x)
22       double x;
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DESCRIPTION

25       Fabs returns the absolute value |x|.
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27       Floor returns the largest integer no greater than x.
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29       Ceil returns the smallest integer no less than x.
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31       Rint returns the integer (represented as  a  double  precision  number)
32       nearest x in the direction of the prevailing rounding mode.
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NOTES

35       On  a  VAX,  rint(x)  is equivalent to adding half to the magnitude and
36       then rounding towards zero.
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38       In the default rounding mode, to nearest, on a machine that conforms to
39       IEEE 754, rint(x) is the integer nearest x with the additional stipula‐
40       tion that if |rint(x)-x|=1/2 then  rint(x)  is  even.   Other  rounding
41       modes  can  make  rint  act  like floor, or like ceil, or round towards
42       zero.
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44       Another way to obtain an integer near x is to declare (in C)
45              double x;     int k;    k = x;
46       Most C compilers round x towards 0 to get the integer k,  but  some  do
47       otherwise.   If in doubt, use floor, ceil, or rint first, whichever you
48       intend.  Also note that, if x is larger than  k  can  accommodate,  the
49       value  of k and the presence or absence of an integer overflow are hard
50       to predict.
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SEE ALSO

53       abs(3), ieee(3M), math(3M)
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574th Berkeley Distribution        May 12, 1986                        FLOOR(3M)