Base-10 logarithmic function
#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)):
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99
The log10() function returns 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).
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
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