C++ Valarray::abs Function

The C++ Valarray::abs()function is used to determine the absolute value of each element in the valarray and returns a valarray that contains the absolute values of all the elements. The magnitude value of a number is its absolute value.

This function is overloaded for integral types in the <cstdlib> abs() function, floating-point types in the <cmath> abs() function, and complex values in the <complex> abs() function.

Syntax

Following is the syntax for C++ Valarray::abs Function − 

abs (const valarray<T>& x);

Parameters

x − It is containing elements of a type for which the unary function abs is defined.

Examples

Example 1

Let's look into the following example, where we are going to use the abs() function and retrieving the output.

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

int main() {
   valarray<int>
   varr = { 1, 2, -3, 4, -5 };
   valarray<int> valarray1;
   valarray1 = abs(varr);
   cout << "The New Valarray "<< "value : ";
   
   for (int& A : valarray1) {
      cout << A << " ";
   }
   cout << endl;
   return 0;
}

Output

Let us compile and run the above program, this will produce the following result −

The New Valarray value : 1 2 3 4 5

Example 2

In the following example, we are going to use the abs() function and retrieving the output with comparison of original and manipulated Valarray.

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

int main() {
   valarray<double> myvalarr = { 10, -12, -13, -5, 9.5 };
   cout << "The  Orignal Valarray Is : ";
   
   for (double& ele : myvalarr)
      cout << ele << " ";
   valarray<double> absValarray;
   absValarray = abs(myvalarr);
   cout << "\nThe  Manipulated Valarray Is : ";
   
   for (double& ele : absValarray)
      cout << ele << " ";
   return 0;
}

Output

Let us compile and run the above program, this will produce the following result −

The  Orignal Valarray Is : 10 -12 -13 -5 9.5 
The  Manipulated Valarray Is : 10 12 13 5 9.5

Example 3

Considering the another scenario, where we are going to check how abs() function work.

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

int main() {
   cout << abs(-143);
   return 0;
}

Output

Let us compile and run the above program, this will produce the following result −

143
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