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

int main() {

    //outputs Hello World!
    cout<<"Hello World!"<<endl;

    //Pauses programme, universal method.
    printf("%s", "Press ENTER key to continue...");
    //Uncomment the next line when there is input.
    //cin.ignore();
    cin.get();

    //Not necessary but a good practice to end the programme. It is a function after all.
    return 0;
}