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valarray pow() Function in C++ with Examples

C++ valarray pow() Function: Here, we will learn about the pow() function, its usages, syntax and examples.
Submitted by Shivang Yadav, on May 13, 2022

The valarray class in C++ is a special container that is used for holding elements like an array and performing operations on them.

C++ STL std::pow(std::valarray) Function

The pow() function of the valarray class is used to return a valarray that contains elements that are elements raised to the power N.

Syntax

template< class T >
std::valarray<T> pow( const std::valarray<T>& base, const std::valarray<T>& exp );

template< class T >
std::valarray<T> pow( const std::valarray<T>& base,
                      const typename std::valarray<T>::value_type& vexp );
template< class T >
std::valarray<T> pow( const typename std::valarray<T>::value_type& vbase,
                      const std::valarray<T>& exp );

// or
pow(valarrayName, N)

Parameter(s)

It accepts two parameters, one the original valarray and the second one is the power to which the element is raised.

Return value

It returns valarray with elements raised to the given power.

Example 1

#include <iostream>
#include <valarray>
using namespace std;

int main()
{
    // Declaring valarray
    valarray<int> myvalarr = { 3, 6, 2, 5, 9, 1 };

    // Printing the elements of valarray
    cout << "The elements of orignal valarray are : ";
    for (int& ele : myvalarr)
        cout << ele << " ";

    // Creating a new valarray of power values
    valarray<int> powValarray;
    powValarray = pow(myvalarr, 4);

    cout << "\nThe elements of power valarray are : ";
    for (int& ele : powValarray)
        cout << ele << " ";

    return 0;
}

Output

The elements of orignal valarray are : 3 6 2 5 9 1 
The elements of power valarray are : 81 1296 16 625 6561 1 

Example 2

#include <iostream>
#include <valarray>
using namespace std;

int main()
{
    // Declaring valarray
    valarray<double> myvalarr = { -3, 6.4, 0.2, -5.3, 9 };

    // Printing the elements of valarray
    cout << "The elements of orignal valarray are : ";
    for (double& ele : myvalarr)
        cout << ele << " ";

    // Creating a new valarray of power values
    valarray<double> powValarray;
    powValarray = pow(myvalarr, 3);

    cout << "\nThe elements of power valarray are : ";
    for (double& ele : powValarray)
        cout << ele << " ";

    return 0;
}

Output

he elements of orignal valarray are : -3 6.4 0.2 -5.3 9 
The elements of power valarray are : -27 262.144 0.008 -148.877 729