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Insert the element at beginning and end of the list | C++ STL

Here, we are going to learn how to insert an element at the beginning and an element at the end of the list using C++ STL? Functions push_front() and push_back() are used to insert the element at front and back to the list.
Submitted by IncludeHelp, on October 30, 2018

Given a list with some of the elements, we have to insert an element at the front (beginning) and an element at the back (end) to the list in C++ (STL) program.

Push_front() and push_back() functions of the list

These are two functions which can be used to insert the element at the front and at the end to the list. push_front() inserts the element at the front and push_back() inserts the element at the back (end).

Let's implement the program below...

Example:

    Input:
    List: [10, 20, 30, 40, 50]
    Element to insert at front: 100
    Element to insert at back: 200

    Output:
    List is:
    100
    10
    20
    30
    40
    50
    200

Program:

#include <iostream>
#include <list>
#include <string>
using namespace std;

int main() 
{
	//declaring aiList
	list<int>iList = {10, 20, 30, 40, 50};
	//declaring iterator to the list
	list<int>::iterator l_iter; 

	//inserting element at the front
	iList.push_front(100);
	//inserting element at the back
	iList.push_back(200);

	//printing list elements
	cout<<"List elements are"<<endl;
	for (l_iter = iList.begin(); l_iter != iList.end(); l_iter++)
		cout<< *l_iter<<endl;

	return 0;
}

Output

List elements are
100
10 
20 
30 
40 
50 
200