Section 5: log



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EXP(3)              Linux Programmer's Manual              EXP(3)


NAME

exp, log, log10, pow - exponential, logarithmic and power functions

SYNOPSIS

#include double exp(double x); double log(double x); double log10(double x); double pow(double x, double y);

DESCRIPTION

The exp() function returns the value of e (the base of natural logarithms) raised to the power of x. The log() function returns the natural logarithm of x. The log10() function returns the base-10 logarithm of x. The pow() function returns the value of x raised to the power of y.

ERRORS

The log() and log10() functions can return the following errors: EDOM The argument x is negative. ERANGE The argument x is zero. The log of zero is not defined. The pow() function can return the following error: EDOM The argument x is negative and y is not an integral value. This would result in a complex number. CONFORMING TO SVID 3, POSIX, BSD 4.3, ISO 9899 SEE ALSO sqrt(3), cbrt(3) GNU June 16, 1993 1