---
name: "remquo"
section: "3"
platform: "linux"
package: "man-pages"
version: "6.19-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/remquo"
---

# remquo(3)

remainder and part of quotient

## NAME

remquo, remquof, remquol - remainder and part of quotient

## LIBRARY

Math library (*libm*, *-lm*)

## SYNOPSIS

```
#include <math.h>
```

**double remquo(double** *x***, double** *y***, int \****quo***);** **float remquof(float** *x***, float** *y***, int \****quo***);** **long double remquol(long double** *x***, long double** *y***, int \****quo***);**

Feature Test Macro Requirements for glibc (see [**feature\_test\_macros**(7)](/feature_test_macros/7.md)):

**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)](/remainder/3.md) 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)](/remainder/3.md).

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)](/math_error/7.md) 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*.

## ATTRIBUTES

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

| | | |
| --- | --- | --- |
| **Interface** | **Attribute** | **Value** |
| **remquo**(), **remquof**(), **remquol**() | Thread safety | MT-Safe |

## STANDARDS

C11, POSIX.1-2008.

## HISTORY

glibc 2.1. C99, POSIX.1-2001.

## SEE ALSO

[**fmod**(3)](/fmod/3.md), [**logb**(3)](/logb/3.md), [**remainder**(3)](/remainder/3.md)