round,  roundf,  roundl  -  round to nearest integer, away
       from zero


SYNOPSIS

       #include <math.h>

       double round(double x);
       float roundf(float x);
       long double roundl(long double x);


DESCRIPTION

       These functions round x to the nearest integer, but  round
       halfway  cases  away  from zero (regardless of the current
       rounding direction), instead of to the nearest even  inte­
       ger like rint().


RETURN VALUE

       The rounded integer value. If x is integral or infinite, x
       itself is returned.


ERRORS

       No errors other than EDOM and ERANGE can occur.  If  x  is
       NaN, then NaN is returned and errno may be set to EDOM.


NOTES

       The Austin draft contains text about overflow (which might
       set errno to ERANGE, or raise an exception).  In practice,
       the result cannot overflow on any current machine, so this
       error-handling stuff is just nonsense.   (More  precisely,
       overflow  can  happen  only  when the maximum value of the
       exponent is smaller than the number of mantissa bits.  For
       the  IEEE-754  standard  32-bit  and 64-bit floating point
       numbers the maximum value of the exponent  is  128  (resp.
       1024),  and the number of mantissa bits is 24 (resp. 53).)


CONFORMING TO

       C99.


SEE ALSO

       ceil(3),  floor(3),  lround(3),   nearbyint(3),   rint(3),
       trunc(3)


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