## Linux and UNIX Man Pages

Test Your Knowledge in Computers #666
Difficulty: Medium
IEEE 802.3 is a working group and a collection of Institute of Electrical and Electronics Engineers (IEEE) standards produced by the working group defining the physical layer and data link layer's media access control (MAC) of wireless Ethernet.
True or False?

# fmodl(3) [linux man page]

```FMOD(3) 						     Linux Programmer's Manual							   FMOD(3)

NAME
fmod, fmodf, fmodl - floating-point remainder function

SYNOPSIS
#include <math.h>

double fmod(double x, double y);
float fmodf(float x, float y);
long double fmodl(long double x, long double y);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

fmodf(), fmodl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION
The  fmod() function computes the floating-point remainder of dividing x by y.  The return value is x - n * y, where n is the quotient of x
/ y, rounded towards zero to an integer.

RETURN VALUE
On success, these functions return the value x - n*y, for some integer n, such that the returned value has the same sign as x and a  magni-
tude less than the magnitude of y.

If x or y is a NaN, a NaN is returned.

If x is an infinity, a domain error occurs, and a NaN is returned.

If y is zero, a domain error occurs, and a NaN is returned.

If x is +0 (-0), and y is not zero, +0 (-0) is returned.

ERRORS
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Domain error: x is an infinity
errno is set to EDOM (but see BUGS).  An invalid floating-point exception (FE_INVALID) is raised.

Domain error: y is zero
errno is set to EDOM.  An invalid floating-point exception (FE_INVALID) is raised.

BUGS
Before version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred for an infinite x.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

remainder(3)

COLOPHON
This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.

2010-09-20								   FMOD(3)```

## Check Out this Related Man Page

```FMOD(3) 						     Linux Programmer's Manual							   FMOD(3)

NAME
fmod, fmodf, fmodl - floating-point remainder function

SYNOPSIS
#include <math.h>

double fmod(double x, double y);
float fmodf(float x, float y);
long double fmodl(long double x, long double y);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

fmodf(), fmodl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION
The  fmod() function computes the floating-point remainder of dividing x by y.  The return value is x - n * y, where n is the quotient of x
/ y, rounded toward zero to an integer.

RETURN VALUE
On success, these functions return the value x - n*y, for some integer n, such that the returned value has the same sign as x and a  magni-
tude less than the magnitude of y.

If x or y is a NaN, a NaN is returned.

If x is an infinity, a domain error occurs, and a NaN is returned.

If y is zero, a domain error occurs, and a NaN is returned.

If x is +0 (-0), and y is not zero, +0 (-0) is returned.

ERRORS
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

The following errors can occur:

Domain error: x is an infinity
errno is set to EDOM (but see BUGS).  An invalid floating-point exception (FE_INVALID) is raised.

Domain error: y is zero
errno is set to EDOM.  An invalid floating-point exception (FE_INVALID) is raised.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.

BUGS
Before version 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred for an infinite x.