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valarray abs() function in C++

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  • Last Updated : 24 Oct, 2018
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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

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