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.

// 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; 
} 

Output:

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

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