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g0001_0100.s0050_powx_n.readme.md Maven / Gradle / Ivy

50\. Pow(x, n)

Medium

Implement [pow(x, n)](http://www.cplusplus.com/reference/valarray/pow/), which calculates `x` raised to the power `n` (i.e., 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
*   `n` is an integer.
*   -104 <= xn <= 104