Obtain the logarithm with a base of 10

[Classification]

Mathematical library

[Syntax]

#include <math.h>

double __far log10(double x);

[Return value]

Returns the logarithm of x with base 10.

log10 returns a Not-a-Number (NaN) and sets macro EDOM to global variable errno if x is negative.

If x is zero, it returns -∞ and sets macro ERANGE to global variable errno.

[Description]

This function calculates the logarithm of x with base 10.