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https://leetcode.com/problems/powx-n
Implement , which calculates x raised to the power n (i.e., xn).
x
n
xn
Example 1:
**Input:** x = 2.00000, n = 10 **Output:** 1024.00000
Example 2:
**Input:** x = 2.10000, n = 3 **Output:** 9.26100
Example 3:
**Input:** x = 2.00000, n = -2 **Output:** 0.25000 **Explanation:** 2-2 = 1/22 = 1/4 = 0.25
Constraints:
-100.0 < x < 100.0
-231 <= n <= 231-1
-104 <= xn <= 104