Calculates the base-10 logarithm of a number
#include <math.h> double log10 ( double x ); float log10f ( float x ); (C99) long double log10l ( long double x ); (C99)
The log10( ) functions calculate the common logarithm of their argument. The common logarithm is the logarithm to base 10. The common logarithm of a number x is defined only for positive values of x. If x is negative, a domain error occurs; if x is zero, a range error may occur.
See the example for log( ) in this chapter.