#include <math.h> double log10(double x); float log10f(float x); long double log10l(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L || /* Since glibc 2.19: */ _DEFAULT_SOURCE || /* Glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the base 10 logarithm of x.
On success, these functions return the base 10 logarithm of x.
For special cases, including where x is 0, 1, negative, infinity, or NaN, see log(3).
See math_error(7) for information on how to determine whether an error has occurred when calling these functions.
For a discussion of the errors that can occur for these functions, see log(3).
For an explanation of the terms used in this section, see attributes(7).
|log10(), log10f(), log10l()||Thread safety||MT-Safe|
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
cbrt(3), clog10(3), exp10(3), log(3), log2(3), sqrt(3)
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exp10(3), log(3), log2(3).
The man pages log10f(3) and log10l(3) are aliases of log10(3).