How to express x to the nth power in C language

In C language, there are two ways to express x raised to the nth power: using the pow function, the syntax is: double pow(double x, double n), returning a floating point number. The bit-shift operator (<<) can be used to calculate 2 raised to the nth power more efficiently, but only supports positive integer powers.

How to express x raised to the nth power in C language

In C language, express x raised to the nth power There are two ways to raise the power:

1. Use the pow function

The pow function is a mathematical function provided in the C standard library and is used to calculate the nth power of x . The syntax is as follows:

<code class="c">double pow(double x, double n);</code>

Where, x is the number to be calculated to the nth power, and n is the power exponent.

Usage:

<code class="c">#include <math.h>

double result = pow(x, n);</p>
<p><strong>2. Use the bit shift operator (<<)</strong></p>
<p>The bit shift operator (&lt ;<) can be used to calculate 2 raised to the nth power. By shifting the number to the left by n places, you get 2 raised to the nth power. </p>
<p><strong>Usage: </strong></p>
<pre class="brush:php;toolbar:false"><code class="c">#define POWER(x, n) (x << n)

int result = POWER(2, n);</code>

Note:

• pow function returns a floating point number, while the shift operator returns an integer .
• The pow function supports negative powers, while the bit shift operator only supports positive integer powers.
• The displacement operator is more efficient because it just does a binary shift, while the pow function requires more complex calculations.

According to your needs, choose the most appropriate method to calculate x raised to the nth power.

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