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valarray size() function in C++

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  • Last Updated : 23 Oct, 2018
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The size() function is defined in valarray header file. This function is used to find the size of valarray and returns the size of valarray.

Syntax:

size_t size() const;

Parameter: This function doesn’t takes any parameter.

Returns: This function returns the number of element in valarray.

Below programs illustrate the above function:

Example 1:-




// C++ program to demonstrate
// example of size() function.
  
#include <bits/stdc++.h>
using namespace std;
int main()
{
  
    // Initializing  valarray
    valarray<int> varr = { 20, 40, 60, 80 };
  
    // Displaying size of valarray
    cout << "The size of valarray is: ";
    cout << varr.size();
  
    cout << endl;
  
    return 0;
}

Output:

The size of valarray is: 4

Example 2:-




// C++ program to demonstrate
// example of size() function.
  
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
  
    // Initializing  valarray
    valarray<int>
        varr = { -20, 40, -50, 60, 80, 0, 0 };
  
    // Displaying size of valarray
    cout << "The size of valarray is: ";
    cout << varr.size();
  
    cout << endl;
  
    return 0;
}

Output:

The size of valarray is: 7

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