
POW(3) Linux Programmer's Manual POW(3)
NAME
pow, powf, powl  power functions
SYNOPSIS
#include <math.h>
double pow(double x, double y);
float powf(float x, float y);
long double powl(long double x, long double y);
Link with lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
powf(), powl():
_BSD_SOURCE  _SVID_SOURCE  _XOPEN_SOURCE >= 600  _ISOC99_SOURCE 
_POSIX_C_SOURCE >= 200112L;
or cc std=c99
DESCRIPTION
The pow() function returns the value of x raised to the power of y.
RETURN VALUE
On success, these functions return the value of x to the power of y.
If x is a finite value less than 0, and y is a finite noninteger, a domain error occurs,
and a NaN is returned.
If the result overflows, a range error occurs, and the functions return HUGE_VAL,
HUGE_VALF, or HUGE_VALL, respectively, with the mathematically correct sign.
If result underflows, and is not representable, a range error occurs, and 0.0 is returned.
Except as specified below, if x or y is a NaN, the result is a NaN.
If x is +1, the result is 1.0 (even if y is a NaN).
If y is 0, the result is 1.0 (even if x is a NaN).
If x is +0 (0), and y is an odd integer greater than 0, the result is +0 (0).
If x is 0, and y greater than 0 and not an odd integer, the result is +0.
If x is 1, and y is positive infinity or negative infinity, the result is 1.0.
If the absolute value of x is less than 1, and y is negative infinity, the result is posi
tive infinity.
If the absolute value of x is greater than 1, and y is negative infinity, the result is
+0.
If the absolute value of x is less than 1, and y is positive infinity, the result is +0.
If the absolute value of x is greater than 1, and y is positive infinity, the result is
positive infinity.
If x is negative infinity, and y is an odd integer less than 0, the result is 0.
If x is negative infinity, and y less than 0 and not an odd integer, the result is +0.
If x is negative infinity, and y is an odd integer greater than 0, the result is negative
infinity.
If x is negative infinity, and y greater than 0 and not an odd integer, the result is pos
itive infinity.
If x is positive infinity, and y less than 0, the result is +0.
If x is positive infinity, and y greater than 0, the result is positive infinity.
If x is +0 or 0, and y is an odd integer less than 0, a pole error occurs and HUGE_VAL,
HUGE_VALF, or HUGE_VALL, is returned, with the same sign as x.
If x is +0 or 0, and y is less than 0 and not an odd integer, a pole error occurs and
+HUGE_VAL, +HUGE_VALF, or +HUGE_VALL, is returned.
ERRORS
See math_error(7) for information on how to determine whether an error has occurred when
calling these functions.
The following errors can occur:
Domain error: x is negative, and y is a finite noninteger
errno is set to EDOM. An invalid floatingpoint exception (FE_INVALID) is raised.
Pole error: x is zero, and y is negative
errno is set to ERANGE (but see BUGS). A dividebyzero floatingpoint exception
(FE_DIVBYZERO) is raised.
Range error: the result overflows
errno is set to ERANGE. An overflow floatingpoint exception (FE_OVERFLOW) is
raised.
Range error: the result underflows
errno is set to ERANGE. An underflow floatingpoint exception (FE_UNDERFLOW) is
raised.
CONFORMING TO
C99, POSIX.12001. The variant returning double also conforms to SVr4, 4.3BSD, C89.
BUGS
In glibc 2.9 and earlier, when a pole error occurs, errno is set to EDOM instead of the
POSIXmandated ERANGE. Since version 2.10, glibc does the right thing.
If x is negative, then large negative or positive y values yield a NaN as the function
result, with errno set to EDOM, and an invalid (FE_INVALID) floatingpoint exception. For
example, with pow(), one sees this behavior when the absolute value of y is greater than
about 9.223373e18.
In version 2.3.2 and earlier, when an overflow or underflow error occurs, glibc's pow()
generates a bogus invalid floatingpoint exception (FE_INVALID) in addition to the over
flow or underflow exception.
SEE ALSO
cbrt(3), cpow(3), sqrt(3)
COLOPHON
This page is part of release 3.55 of the Linux manpages project. A description of the
project, and information about reporting bugs, can be found at
http://www.kernel.org/doc/manpages/.
20100912 POW(3) 
