powx-n

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Algorithms

Implement <a href="http://www.cplusplus.com/reference/valarray/pow/" target="_blank">pow(x, n)</a>, which calculates <code>x</code> raised to the power <code>n</code> (i.e., <code>xn</code>).

&nbsp;
Example 1:

<pre>
Input: x = 2.00000, n = 10
Output: 1024.00000
</pre>

Example 2:

<pre>
Input: x = 2.10000, n = 3
Output: 9.26100
</pre>

Example 3:

<pre>
Input: x = 2.00000, n = -2
Output: 0.25000
Explanation: 2-2 = 1/22 = 1/4 = 0.25
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>-100.0 &lt; x &lt; 100.0</code></li>
	<li><code>-231 &lt;= n &lt;= 231-1</code></li>
	<li><code>n</code> is an integer.</li>
	<li>Either <code>x</code> is not zero or <code>n &gt; 0</code>.</li>
	<li><code>-104 &lt;= xn &lt;= 104</code></li>
</ul>