Base-10 logarithm of a complex number

**#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***);**

Link with *-lm*.

The call *clog10(z)* is equivalent to *clog(z)/log(10)*. The other functions perform the same task for *float* and *long double*.

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

These functions first appeared in glibc in version 2.1.

This function is a GNU extension. It is reserved for future use in C99.

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