clog10, clog10f, clog10l — 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:


or equally:

   log10(cabs(c)) + I * carg(c) / 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.


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.

See Also

cabs(3), cexp(3), clog(3), clog2(3), complex(7)


This page is part of release 5.04 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at

Referenced By

cexp2(3), clog(3), clog2(3), complex(7), log10(3).

The man pages clog10f(3) and clog10l(3) are aliases of clog10(3).

2017-09-15 Linux Programmer's Manual