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valarray sqrt() function in C++

Last Updated : 24 Oct, 2018
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The sqrt() function is defined in valarray header file. This function is used to calculate square root of the value of each element in valarray. Syntax: 
sqrt(varr);
Parameter: This function takes a mandatory parameter varr which represents valarray. Returns: This function returns a valarray containing the square root of all the elements of valarray. Below programs illustrate the above function: Example 1:- CPP 
// C++ program to demonstrate
// example of sqrt() function.

#include <bits/stdc++.h>
using namespace std;
int main()
{
    // Initializing valarray
    valarray<double>
        varr = { 4, 16, 25, 36, 49 };

    // Declaring new valarray
    valarray<double> varr1;

    // use of sqrt() function
    varr1 = sqrt(varr);

    // Displaying new elements value
    cout << "The new valarray with"
         << " manipulated values is : "
         << endl;

    for (double& x : varr1) {
        cout << x << " ";
    }

    cout << endl;

    return 0;
}
Output: 
The new valarray with manipulated values is : 
2 4 5 6 7
Example 2:- CPP 
// C++ program to demonstrate
// example of sqrt() function.

#include <bits/stdc++.h>
using namespace std;
int main()
{
    // Initializing valarray
    valarray<double>
        varr = { 5, 16, 26, 37, 1 };

    // Declaring new valarray
    valarray<double> varr1;

    // use of sqrt() function
    varr1 = sqrt(varr);

    // Displaying new elements value
    cout << "The new valarray with"
         << " manipulated values is : "
         << endl;

    for (double& x : varr1) {
        cout << x << " ";
    }

    cout << endl;

    return 0;
}
Output: 
The new valarray with manipulated values is : 
2.23607 4 5.09902 6.08276 1

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