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Assign a list with array elements | C++ STL

Here, we are going to learn how to assign a list with the elements of an array in C++ STL?
Submitted by IncludeHelp, on November 02, 2018

Problem statement

Given an array and we have to create a list, that should be assigned with all elements of the array using C++ (STL) program.

Approach

Here, we are declaring a list list1 and an array arr, arr has 5 elements, all elements of the arr are assigning to the list list1 by using following statements,

list1.assign(arr+0, arr+5);

Here,

• list1 is a list of integer type
• arr is an integer array
• arr+0 points the first element of the array
• And, arr+4 points the last element of the array

C++ program to assign a list with array elements

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

// function to display the list
void dispList(list<int> L) {
  // declaring iterator to the list
  list<int>::iterator l_iter;
  for (l_iter = L.begin(); l_iter != L.end(); l_iter++) cout << *l_iter << " ";
  cout << endl;
}

int main() {
  // list1 declaration
  list<int> list1;
  // array declaration
  int arr[] = {10, 20, 30, 40, 50};

  // displaying list1
  cout << "Before assign... " << endl;
  cout << "Size of list1: " << list1.size() << endl;
  cout << "Elements of list1: ";
  dispList(list1);

  // assigning array Elements to the list
  list1.assign(arr + 0, arr + 5);

  // displaying list1
  cout << "After assigning... " << endl;
  cout << "Size of list1: " << list1.size() << endl;
  cout << "Elements of list1: ";
  dispList(list1);

  return 0;
}

Output

Before assign...
Size of list1: 0
Elements of list1:
After assigning...
Size of list1: 5
Elements of list1: 10 20 30 40 50