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Showing content from https://www.geeksforgeeks.org/cpp/multiset-size-in-c-stl-with-examples/ below:

multiset size() in C++ STL with Examples

Last Updated : 11 Jul, 2025

The

multiset::size()

is a built-in function in C++ STL which returns the number of elements in the multiset container.

Syntax:

multiset_name.size()

Parameters:

The function does not accept any parameters.

Return Value:

The function returns the number of elements in the multiset container. Below programs illustrate the above function:

Program 1: CPP


 // CPP program to demonstrate the
// multiset::size() function
#include <bits/stdc++.h>
using namespace std;
int main()
{

    multiset<int> s;

    // Function to insert elements
    // in the multiset container
    s.insert(10);
    s.insert(13);

    cout << "The size of multiset: " << s.size();
    s.insert(13);
    s.insert(25);

    cout << "\nThe size of multiset: " << s.size();
    s.insert(24);

    cout << "\nThe size of multiset: " << s.size();
    return 0;
}

Output:

The size of multiset: 2
The size of multiset: 4
The size of multiset: 5

Program 2: CPP


 // CPP program to demonstrate the
// multiset::size() function
#include <bits/stdc++.h>
using namespace std;
int main()
{

    multiset<int> s;

    cout << "The size of multiset: " << s.size();
    s.insert(2);
    s.insert(3);

    cout << "\nThe size of multiset: " << s.size();
    s.insert(4);

    cout << "\nThe size of multiset: " << s.size();
    return 0;
}

Output:

The size of multiset: 0
The size of multiset: 2
The size of multiset: 3

All functions of

std::multiset

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