list push_back() function in C++ STL

The list:push_back() function in C++ STL is used to add a new element to an existing list container. It takes the element to be added as a parameter and adds it to the list container.

Syntax:

list_name.push_back(value) 

Parameters: This function accepts a single parameter which is mandatory value. This refers to the element needed to be added to the list, list_name.

Return Value: The return type of this function is void and it does not returns any value.

Below program illustrates the list::push_back() function.

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// CPP program to illustrate the
// list::push_back() function
#include <bits/stdc++.h>
using namespace std;
  
int main()
{
    // Initialization of list
    list<int> demo_list;
  
    // intital size of list
    cout << "Initial Size of the list: "
         << demo_list.size() << endl;
  
    // Adding elements to the list
    // using push_back function
    demo_list.push_back(10);
    demo_list.push_back(20);
    demo_list.push_back(30);
  
    // Size of list after adding
    // some elements
    cout << "Size of list after adding three "
         << "elements: " << demo_list.size();
  
    return 0;
}

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Output:

Initial Size of the list: 0
Size of list after adding three elements: 3


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