### 3. Library calls (functions within program libraries)

# REMQUO

Section: Linux Programmer's Manual (3)Updated: 2017-09-15

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## NAME

remquo, remquof, remquol - remainder and part of quotient## SYNOPSIS

#include <math.h>double remquo(doublex, doubley, int *quo);float remquof(floatx, floaty, int *quo);long double remquol(long doublex, long doubley, int *quo);

Link with *-lm*.

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

**remquo**(),
**remquof**(),
**remquol**():

- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

## DESCRIPTION

These functions compute the remainder and part of the quotient upon division of*x*by

*y*. A few bits of the quotient are stored via the

*quo*pointer. The remainder is returned as the function result.

The value of the remainder is the same as that computed by the
**remainder**(3)
function.

The value stored via the
*quo*
pointer has the sign of
*x / y*
and agrees with the quotient in at least the low order 3 bits.

For example, *remquo(29.0, 3.0)* returns -1.0 and might store 2.
Note that the actual quotient might not fit in an integer.

## RETURN VALUE

On success, these functions return the same value as the analogous functions described in**remainder**(3).

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

If
*x*
is an infinity,
and
*y*
is not a NaN,
a domain error occurs, and
a NaN is returned.

If
*y*
is zero,
and
*x*
is not a NaN,
a domain error occurs, and
a NaN 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 or*y*is 0, and the other argument is not a NaN -
An invalid floating-point exception
(
**FE_INVALID**) is raised.

These functions do not set
*errno*.

## VERSIONS

These functions first appeared in glibc in version 2.1.## ATTRIBUTES

For an explanation of the terms used in this section, see**attributes**(7).

Interface | Attribute | Value |

remquo(),
remquof(),
remquol()
| Thread safety | MT-Safe |

## CONFORMING TO

C99, POSIX.1-2001, POSIX.1-2008.## SEE ALSO

**fmod**(3),

**logb**(3),

**remainder**(3)

## COLOPHON

This page is part of release 4.15 of the Linux*man-pages*project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

## Index

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