# clog10 (3) - Linux Manuals

## clog10: base-10 logarithm of a complex number

## NAME

clog10, clog10f, clog10l - base-10 logarithm of a complex number

## SYNOPSIS

**#define _GNU_SOURCE**/* See feature_test_macros(7) */

**#include <complex.h>**

**double complex clog10(double complex ***z***);**

**float complex clog10f(float complex ***z***);**

**long double complex clog10l(long double complex ***z***);**

## DESCRIPTION

The call*clog10(z)*is equivalent to:

or equally:

The other functions perform the same task for
*float*
and
*long double*.

Note that
*z*
close to zero will cause an overflow.

## 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 |

clog10(),
clog10f(),
clog10l()
| Thread safety | MT-Safe |

## CONFORMING TO

These functions are GNU extensions. The identifiers are reserved for future use in C99 and C11.## COLOPHON

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