---
name: "lrint"
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/lrint"
---

# lrint(3)

round to nearest integer

## NAME

lrint, lrintf, lrintl, llrint, llrintf, llrintl - round to nearest integer

## LIBRARY

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

## SYNOPSIS

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

**long lrint(double** *x***);** **long lrintf(float** *x***);** **long lrintl(long double** *x***);**

**long long llrint(double** *x***);** **long long llrintf(float** *x***);** **long long llrintl(long double** *x***);**

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

All functions shown above:

```
    _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
```

## DESCRIPTION

These functions round their argument to the nearest integer value, using the current rounding direction (see [**fesetround**(3)](/fesetround/3.md)).

Note that unlike the [**rint**(3)](/rint/3.md) family of functions, the return type of these functions differs from that of their arguments.

## RETURN VALUE

These functions return the rounded integer value.

If *x* is a NaN or an infinity, or the rounded value is too large to be stored in a *long* (*long long* in the case of the **ll\*** functions), then a domain error occurs, and the return value is unspecified.

## 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 a NaN or infinite, or the rounded value is too large

  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** |
| **lrint**(), **lrintf**(), **lrintl**(), **llrint**(), **llrintf**(), **llrintl**() | Thread safety | MT-Safe |

## STANDARDS

C11, POSIX.1-2008.

## HISTORY

glibc 2.1. C99, POSIX.1-2001.

## SEE ALSO

[**ceil**(3)](/ceil/3.md), [**floor**(3)](/floor/3.md), [**lround**(3)](/lround/3.md), [**nearbyint**(3)](/nearbyint/3.md), [**rint**(3)](/rint/3.md), [**round**(3)](/round/3.md)