log10 man page

log10, log10f, log10l — base-10 logarithmic function

Synopsis

#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)):

log10f(), log10l():

_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 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).

InterfaceAttributeValue
log10(), log10f(), log10l()Thread safetyMT-Safe

Conforming to

C99, POSIX.1-2001, POSIX.1-2008.

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)

Colophon

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Referenced By

exp10(3), log(3), log2(3).

log10f(3) and log10l(3) are aliases of log10(3).

2016-03-15 Linux Programmer's Manual