NAME
lround(), lroundf(), lroundl(), lroundw(), lroundq() — round to long int functions
SYNOPSIS
#include <math.h>
long int lround(double x);
HP Integrity Server Only
long int lroundf(float x);
long int lroundl(long double x);
long int lroundw(extended x);
long int lroundq(quad x);
DESCRIPTION
lround()
rounds its argument to the nearest integral value.
An argument exactly halfway between two integers is rounded away from
zero, regardless of the current rounding direction.
Rounding away from zero also applies to the functions,
round
and
llround.
lround()
is equivalent to
llround(),
except that it rounds to
long int
instead of
long long.
Integrity Server Only
lroundf()
is a
float
version of
lround();
it takes a
float
argument.
lroundl()
is a
long double
version of
lround();
it takes a
long double
argument.
lroundw()
is an
extended
version of
lround();
it takes an
extended
argument.
lroundq()
is equivalent to
lroundl()
on HP-UX systems.
USAGE
To use these functions,
compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options.
To use (for Integrity servers)
lroundw()
or
lroundq(),
compile also with the
-fpwidetypes
option.
Make sure your program includes
<math.h>.
Link in the math library by specifying
-lm
on the compiler or linker command line.
For more information, see the
HP-UX floating-point guide for HP Integrity servers
at the following site:
http://www.hp.com/go/fp.
RETURN VALUE
If the rounded value is outside
the range of
long int,
the numeric result is the maximum or minimum
long int
value and the invalid floating-point
exception is raised. On Integrity servers, if the rounded value is outside
the range of
long int,
the numeric result is the minimum
long int
value.
When
lround()
raises no other floating-point exception and the result differs from
the argument, the function may raise the inexact floating-point
exception.
ERRORS
No errors are defined.
SEE ALSO
ceil(3M),
floor(3M),
fabs(3M),
fmod(3M),
fegetround(3M),
fesetround(3M),
lrint(3M),
llrint(3M),
llround(3M),
rint(3M),
round(3M),
trunc(3M),
math(5),
fenv(5).
STANDARDS CONFORMANCE
lround(),
lroundf(),
lroundl()
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')
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