логарифмическая функция по основанию 10 (base-10 logarithmic function)
Имя (Name)
log10, log10f, log10l - base-10 logarithmic function
Синопсис (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 <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Описание (Description)
These functions return the base 10 logarithm of x.
Возвращаемое значение (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).
Ошибки (Error)
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).
Атрибуты (Attributes)
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────┼───────────────┼─────────┤
│log10(), log10f(), log10l() │ Thread safety │ MT-Safe │
└──────────────────────────────────────┴───────────────┴─────────┘
Стандарты (Conforming to)
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD, C89.
Смотри также (See also)
cbrt(3), clog10(3), exp10(3), log(3), log2(3), sqrt(3)
