# 
#  Overview
The **`exp2()`** function is used to return the base-2 exponential function of a given parameter value, `x`.

Mathematically, `exp2()` is given as follows:

exp2(x) = $2^{x}$

>Note: The base-2 exponential function simply means $2^{x}$.

# 
#  Syntax
```
double exp2(double x);
float exp2(float x);
long double exp2(long double x);
```
# 
## Parameters 
This function takes a single parameter `x`, which is a number that can be positive, negative, or zero.
##
## Return value
The `exp2()` function returns the value of numbers within 0 and ∞.

##
## Example



#include <iostream>
#include <cmath>

using namespace std;

int main()
{
  // creating our variables
	double x = -5.5, result;
	
  // using the exp2() function
	result = exp2(x);
	cout << "exp2(-5.5) = " << result << endl;

	return 0;
}

# 
## Explanation
* Line 9: We create the variables `x` and `result`.

* Line 12: We implement the `exp2()` function on the `x` variable and assign the output to the `result` variable.
* Line 13: We print the `result` variable.


What is the exp2() function in C++?

The exp2() function in C++ computes 2 raised to the power of a given parameter x.