/* * (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands. * See the copyright notice in the ACK home directory, in the file "Copyright". * * Author: Ceriel J.H. Jacobs */ /* $Header$ */ #include #include #include "localmath.h" double log10(double x) { if (x < 0) { errno = EDOM; return -HUGE_VAL; } else if (x == 0) { errno = ERANGE; return -HUGE_VAL; } return log(x) / M_LN10; }