Pow(x, n)


Implement pow(x, n), which calculates x raised to the power n (i.e., xn).
Input: x = 2.00000, n = 10 Output: 1024.00000 Input: x = 2.00000, n = -2 Output: 0.25000 Explanation: 2-2 = 1/22 = 1/4 = 0.25
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