log10(3) Library Functions Manual log10(3)
NAME
log10, log10f, log10l - base-10 logarithmic function
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#include <math.h>
double log10(double x);
float log10f(float x);
long double log10l(long double x);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
log10f(), log10l():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These functions return the base-10 logarithm of x.
RETURN VALUE
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).
ERRORS
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).
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│ Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│ log10(), log10f(), log10l() │ Thread safety │ MT-Safe │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
C11, POSIX.1-2008.
HISTORY
C99, POSIX.1-2001.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
SEE ALSO
cbrt(3), clog10(3), exp10(3), log(3), log2(3), sqrt(3)
Linux man-pages 6.9.1 2024-05-02 log10(3)
Generated by dwww version 1.16 on Fri Dec 12 05:59:56 CET 2025.