NAME
floor(), floorf(), floorl(), floorw(), floorq() — floor functions
SYNOPSIS
#include <math.h>
double floor(double x);
IA-64 ONLY:
float floorf(float x);
long double floorl(long double x);
extended floorw(extended x);
quad floorq(quad x);
DESCRIPTION
The
floor()
returns the largest integer (represented as a double-precision number)
not greater than
x.
IA-64 ONLY:
floorf()
is a
float
version of
floor();
it takes a
float
argument and returns a
float
result.
floorl()
is a
long double
version of
floor();
it takes a
long double
argument and returns a
long double
result.
floorw()
is an
extended
version of
floor();
it takes an
extended
argument and returns an
extended
result.
floorq()
is equivalent to
floorl()
on HP-UX systems.
USAGE
To use (for IA-64 systems)
floorf(),
compile either with the default
-Ae
option or with the
-Aa
option.
To use (for IA-64 systems)
floorl(),
floorw(), or
floorq(),
compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options.
To use (for IA-64 systems)
floorw()
or
floorq(),
compile also with the
-fpwidetypes
option.
To use these functions, 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.
RETURN VALUE
If
x
is
±INFINITY or ±zero,
floor()
returns
x.
If
x
is NaN,
floor()
returns NaN.
floor()
may raise the inexact exception if
x
is non integral and finite.
ERRORS
No errors are defined.
STANDARDS CONFORMANCE
floor()
: SVID3, XPG4.2, ANSI C, ISO/IEC C99
(including Annex F, ``IEC 60559 floating-point arithmetic'')
floorf(),
floorl()
: ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')
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