---
name: "ldexpl"
section: "3"
platform: "freebsd"
package: "base"
version: "16.0-CURRENT-20261027-61c70dc16a79"
release: "FreeBSD 16.0-CURRENT (2026-10-27)"
platforms: ["linux", "freebsd"]
url: "https://new.carta.tech/ldexp"
---

# ldexpl(3)

multiply floating-point number by integral power of 2

Part of [ldexp(3)](/ldexp/3.md).

## NAME

**ldexp**, **ldexpf**, **ldexpl** – multiply floating-point number by integral power of 2

## LIBRARY

Math Library (libm, -lm)

## SYNOPSIS

**#include \<math.h\>**

*double*\

**ldexp**(*double x*, *int exp*);

*float*\

**ldexpf**(*float x*, *int exp*);

*long* *double*\

**ldexpl**(*long double x*, *int exp*);

## DESCRIPTION

The **ldexp**(), **ldexpf**(), and **ldexpl**() functions multiply a floating-point number by an integral power of 2.

## RETURN VALUES

These functions return the value of *x* times 2 raised to the power *exp*.

## SEE ALSO

[frexp(3)](/frexp/3.md), [math(3)](/math/3.md), [modf(3)](/modf/3.md)

## STANDARDS

The **ldexp**(), **ldexpf**(), and **ldexpl**() functions conform to ISO/IEC 9899:1999 (“ISO C99”).