NAME
fmod(), fmodf() — remainder functions
SYNOPSIS
#include <math.h>
double fmod(double x, double y);
float fmodf(float x, float y);
DESCRIPTION
The
fmod()
function returns the floating-point remainder
(f)
of the division of
x
by
y,
where
f
has the same sign as
x,
such that
x=iy+f
for some integer
i,
and
|f| < |y|.
fmodf()
is a
float
version of
fmod();
it takes
float
arguments and returns a
float
result.
To use this function, compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options.
fmodf()
is not specified by any standard, but it
is named in accordance with the conventions specified in
the "Future Library Directions" section of the
ANSI C standard.
To use these functions, make sure your program includes
<math.h>,
and link in the math library by specifying
-lm
on the compiler or linker command line.
RETURN VALUE
If
y
is ±INFINITY and
x
is not ±INFINITY,
fmod()
returns
x.
If
x
is ±zero and
y
is a nonzero number,
fmod()
returns
x.
If
x
or
y
is NaN,
fmod()
returns NaN.
If the correct value after rounding would be smaller in magnitude than
MINDOUBLE,
fmod()
returns zero.
If
y
is zero,
fmod()
returns NaN and sets
errno
to [EDOM].
If
x
is ±INFINITY,
fmod()
returns NaN and sets
errno
to [EDOM].
ERRORS
If
fmod()
fails,
errno
is set to one of the following values.
- [EDOM]
y
is zero.
- [EDOM]
x
is ±INFINITY.
STANDARDS CONFORMANCE
fmod(): SVID3, XPG4.2, ANSI C
