How to create a List with Constructor in C++ STL
Lists are sequence containers that allow non-contiguous memory allocation. As compared to vector, list has slow traversal, but once a position has been found, insertion and deletion are quick. Normally, when we say a List, we talk about doubly linked list. For implementing a singly linked list, we use forward list.
A list can be created with the help of constructor in C++. The syntax to do it is:
Syntax:
list<type> list_name(size_of_list, value_to_be_inserted);
Below programs show how to create a List with Constructor in C++.
Program 1:
#include <iostream> #include <list> using namespace std; // Function to print the list void printList(list< int > mylist) { // Get the iterator list< int >::iterator it; // printing all the elements of the list for (it = mylist.begin(); it != mylist.end(); ++it) cout << ' ' << *it; cout << '\n' ; } int main() { // Create a list with the help of constructor // This will insert 100 10 times in the list list< int > myList(10, 100); printList(myList); return 0; } |
Output:
100 100 100 100 100 100 100 100 100 100
Program 2:
#include <bits/stdc++.h> using namespace std; // Function to print the list void printList(list<string> mylist) { // Get the iterator list<string>::iterator it; // printing all the elements of the list for (it = mylist.begin(); it != mylist.end(); ++it) cout << ' ' << *it; cout << '\n' ; } int main() { // Create a list with the help of constructor // This will insert Beginner 5 times in the list list<string> myList(5, "Beginner" ); printList(myList); return 0; } |
Output:
Beginner Beginner Beginner Beginner Beginner
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