log10 is a function in many programming languages that returns the common logarithm of the input.

Implementation

Log base 10 can be calculated using the following formula.

An unoptimized implementation of log10 in C might look like:

#define LOG10 2.30258509299404568401799145468436421
double log10(double x)
{
    if (x < 0)
    {
        errno = EDOM;
        return -HUGE_VAL;
    }
    else if (x == 0)
    {
        errno = ERANGE;
        return -HUGE_VAL;
    }

    return log(x) / LOG10;
}

Language support

Language	Function	Package/Module
C	log10	math.h
C++	log10	cmath
Go	Log10	math
Haskell	-
Java	log10	java.lang.Math
Lisp	log10
Lua	log10	math
mIRC	log10
Pascal	-
Perl	-
PHP	log10
Python	log10	math
Ruby	log10	Math

See also

• log