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

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