---
name: "cexp"
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/cexp"
---

# cexp(3)

complex exponential function

## NAME

cexp, cexpf, cexpl - complex exponential function

## LIBRARY

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

## SYNOPSIS

```
#include <complex.h>
```

**double complex cexp(double complex** *z***);** **float complex cexpf(float complex** *z***);** **long double complex cexpl(long double complex** *z***);**

## DESCRIPTION

These functions calculate e (2.71828..., the base of natural logarithms) raised to the power of *z*.

One has:

```
cexp(I * z) = ccos(z) + I * csin(z)
```

## ATTRIBUTES

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

| | | |
| --- | --- | --- |
| **Interface** | **Attribute** | **Value** |
| **cexp**(), **cexpf**(), **cexpl**() | Thread safety | MT-Safe |

## STANDARDS

C11, POSIX.1-2008.

## HISTORY

glibc 2.1. C99, POSIX.1-2001.

## SEE ALSO

[**cabs**(3)](/cabs/3.md), [**cexp2**(3)](/cexp2/3.md), [**clog**(3)](/clog/3.md), [**cpow**(3)](/cpow/3.md), [**complex**(7)](/complex/7.md)