Implement pow(x, n), which calculates x raised to the power n (i.e., xn).
-100.0 < x < 100.0-2^31 <= n <= 2^31 - 1n is an integerx is not zero or n > 0-10^4 <= x^n <= 10^4x = 2.00000, n = 101024.00000x = 2.10000, n = 39.26100x = 2.00000, n = -20.25000