valarray resize() function in C++

valarray sum() in C++

Last Updated : 23 Oct, 2018

The sum() function is defined in valarray header file. This function returns the sum of all the elements in the valarray, as if calculated by applying operator+= to a copy of one element and all the other elements, in an unspecified order.

Syntax:

T sum() const;

Returns: This function returns the sum of all the elements in the valarray.

Below programs illustrate the above function:

Example 1:-

// C++ program to demonstrate 
// example of sum() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // Initializing valarray 
    valarray<int> varr = { 15, 10, 30, 33, 40 }; 
  
    // Displaying sum of valarray 
    cout << "The sum of valarray is = "
         << varr.sum() << endl; 
  
    return 0; 
} 

Output:

The sum of valarray is = 128

Example 2:-

// C++ program to demonstrate 
// example of sum() function. 
  
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
  
    // Initializing valarray 
    valarray<int> varr = { 1, 2, 3, 4, 5 }; 
  
    // Displaying sum of valarray 
    cout << "The sum of valarray is = "
         << varr.sum() << endl; 
  
    return 0; 
} 

Output:

The sum of valarray is = 15

valarray resize() function in C++

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