valarray abs() function in C++

The abs() function is defined in valarray header file. This function is used to calculate the absolute value of each element in the valarray and returns a valarray containing the absolute values of all the elements.

Syntax:

abs(varr);

Parameter: This function takes a mandatory parameter varr which represents valarray.

Returns: This function returns a valarray containing the absolute values of all the elements.

Below programs illustrate the above function:

Example 1:-

// C++ program to demonstrate
// example of abs() function.

#include <bits/stdc++.h>
using namespace std;

int main()
{
    // Initializing valarray
    valarray<int>
        varr = { 20, 12, -20, 0, -30 };

    // Declaring new valarray
    valarray<int> varr1;

    // use of abs() function
    // for finding abs value
    varr1 = abs(varr);

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

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

    cout << endl;

    return 0;
}

Output:

The new valarray with manipulated values is : 20 12 20 0 30

Example 2:-

// c++ program to demonstrate
// example of abs() function.

#include <bits/stdc++.h>
using namespace std;
int main()
{
    // Initializing valarray
    valarray<int>
        varr = { -36, -369, -20, 0, -30 };

    // Declaring new valarray
    valarray<int> varr1;

    // use of abs() function
    // for finding abs value
    varr1 = abs(varr);

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

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

    cout << endl;

    return 0;
}

Output:

The new valarray with manipulated values is : 36 369 20 0 30