LOG(3) BSD Library Functions Manual LOG(3)[top]NAMElog, logf, logl, log10, log10f, log1p,log1pf— logarithm functionsLIBRARYMath Library (libm, -lm)SYNOPSIS#include <math.h> double log(double x); float logf(float x); double log10(double x); float log10f(float x); double log1p(double x); float log1pf(float x);DESCRIPTIONThe log() and logf() functions compute the natural logarithm of x. The log10() and log10f() functions compute the logarithm base 10 of x. The log1p() and log1pf() functions compute the natural logarithm of 1 + x. Computing the natural logarithm as log1p(x) is more accurate than computing it as log(1 + x) when x is close to zero.RETURN VALUESThese functions return the requested logarithm; the logarithm of 1 is +0. An attempt to take the logarithm of ±0 results in a divide-by-zero excep‐ tion, and -∞ is returned. Otherwise, attempting to take the logarithm of a negative number results in an invalid exception and a return value of NaN.SEE ALSOexp(3), ilogb(3), math(3), pow(3)STANDARDSThe log(), logf(), log10(), log10f(), log1p(), and log1pf() functions conform to ISO/IEC 9899:1999 (“ISO C99”).BSDJanuary 17, 2008 BSD

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