.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de)
.\"
.\" %%%LICENSE_START(GPL_NOVERSION_ONELINE)
.\" Distributed under GPL
.\" %%%LICENSE_END
.\"
.TH CLOG10 3 2017-09-15 "" "Linux Programmer's Manual"
.SH NAME
clog10, clog10f, clog10l \- base-10 logarithm of a complex number
.SH SYNOPSIS
.BR "#define _GNU_SOURCE" "         /* See feature_test_macros(7) */"
.br
.B #include <complex.h>
.PP
.BI "double complex clog10(double complex " z );
.br
.BI "float complex clog10f(float complex " z );
.br
.BI "long double complex clog10l(long double complex " z );
.PP
Link with \fI\-lm\fP.
.SH DESCRIPTION
The call
.I clog10(z)
is equivalent to:
.PP
    clog(z)/log(10)
.PP
or equally:
.PP
    log10(cabs(c)) + I * carg(c) / log(10)
.PP
The other functions perform the same task for
.I float
and
.IR "long double" .
.PP
Note that
.I z
close to zero will cause an overflow.
.SH VERSIONS
These functions first appeared in glibc in version 2.1.
.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lbw30 lb lb
l l l.
Interface	Attribute	Value
T{
.BR clog10 (),
.BR clog10f (),
.BR clog10l ()
T}	Thread safety	MT-Safe
.TE
.SH CONFORMING TO
These functions are GNU extensions.
The identifiers are reserved for future use in C99 and C11.
.SH SEE ALSO
.BR cabs (3),
.BR cexp (3),
.BR clog (3),
.BR clog2 (3),
.BR complex (7)
.SH COLOPHON
This page is part of release 4.16 of the Linux
.I man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.