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LEARN ABOUT OPENDARWIN

pow

POW(3)							   BSD Library Functions Manual 						    POW(3)

NAME

     pow -- power function

SYNOPSIS

     #include <math.h>

     double
     pow(double x, double y);

DESCRIPTION

     The pow() functions compute x raised to the power y.

SPECIAL VALUES

     pow(+-0, y) returns +-infinity and raises the "divide-by-zero" floating-point exception for y an odd integer < 0.

     pow(+-0, y) returns +infinity and raises the "divide-by-zero" floating-point exception for y < 0 and not an odd integer.

     pow(+-0, y) returns +-0 for y an odd integer > 0.

     pow(+-0, y) returns +0 for y > 0 and not an odd integer.

     pow(-1, +-infinity) returns 1.

     pow(1, y) returns 1 for any y, even a NaN.

     pow(x, +-0) returns 1 for any x, even a NaN.

     pow(x, y) returns a NaN and raises the "invalid" floating-point exception for finite x < 0 and finite non-integer y.

     pow(x, -infinity) returns +infinity for |x| < 1.

     pow(x, -infinity) returns +0 for |x| > 1.

     pow(x, +infinity) returns +0 for |x| < 1.

     pow(x, +infinity) returns +infinity for |x| > 1.

     pow(-infinity, y) returns -0 for y an odd integer < 0.

     pow(-infinity, y) returns +0 for y < 0 and not an odd integer.

     pow(-infinity, y) returns -infinity for y an odd integer > 0.

     pow(-infinity, y) returns +infinity for y > 0 and not an odd integer.

     pow(+infinity, y) returns +0 for y < 0.

     pow(+infinity, y) returns +infinity for y > 0.

     A domain error occurs if x is finite and negative and y is finite and not an integer.

     A domain error can occur if x is 0 and y less than or equal to 0.

     Range errors may occur.

SEE ALSO

     math(3), infnan(3)

STANDARDS

     The pow() function conforms to ISO/IEC 9899:1999(E).

4th Berkeley Distribution					   July 12, 2003					 4th Berkeley Distribution