Synopsis

double pow(double x,
           double y);

Description

pow computes x raised to the power y.

If x < 0 and y ? 0, errno is set to EDOM and pow returns ?HUGE_VAL. If x ? 0 and y is not an integer value, errno is set to EDOM and pow returns ?HUGE_VAL.

If y = 0, pow returns 1.
If y = 1, pow returns x.
If y = NaN, pow returns NaN.
If x = NaN and y is anything other than 0, pow returns NaN.
If x < ?1 or 1 < x, and y = +∞, pow returns +∞.
If x < ?1 or 1 < x, and y = ?∞, pow returns 0.
If ?1 < x < 1 and y = +∞, pow returns +0.
If ?1 < x < 1 and y = ?∞, pow returns +∞.
If x = +1 or x = ?1 and y = +∞ or y = ?∞, pow returns NaN.
If x = +0 and y > 0 and y ? NaN, pow returns +0.
If x = ?0 and y > 0 and y ? NaN or y not an odd integer, pow returns +0.
If x = +0 and y and y ? NaN, pow returns +∞.
If x = ?0 and y > 0 and y ? NaN or y not an odd integer, pow returns +∞.
If x = ?0 and y is an odd integer, pow returns ?0.
If x = +∞ and y > 0 and y ? NaN, pow returns +∞.
If x = +∞ and y < 0 and y ? NaN, pow returns +0.
If x = ?∞, pow returns pow(?0, y)
If x < 0 and x ? ∞ and y is a non-integer, pow returns NaN.