exp, log, log10, pow − exponential, logarithmic and power functions |
#include <math.h> double exp(double x); double log(double x); double log10(double x); double pow(double x, double y); |
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. |
The log() and log10() functions can return the following errors: |
EDOM |
The argument x is negative. |
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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. |
SVID 3, POSIX, BSD 4.3, ISO 9899 |
sqrt(3), cbrt(3) |