valarray size() function in C++

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:- CPP

// 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;
}

Example 2:- CPP

// 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;
}