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Pow(x, n)

Challenge Points: 20

Level: Medium

Implement a function that returns the exponential value of a number, computed as x to the power n.
Handle cases where n is zero, positive, or negative.
Precision of floating-point arithmetic should be maintained up to at least 5 decimal places.

Example 1:

Input: x = 10.00000, n = 2

Output: 100.00000

Example 2:

Input: x = 0.50000, n = 4

Output: 0.06250

Explanation:

0.5⁴ = 0.5 × 0.5 × 0.5 × 0.5 = 0.0625

Example 3:

Input: x = 3.00000, n = -2

Output: 0.11111

Explanation:

3⁻² = 1/9 ≈ 0.11111

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