#include <iostream>
#include <conio.h>
using namespace std;

int main() {
    cout << "Hello world!" << endl;
    // endl = End of line, ends the output line and starts a new one...

    cout << "endl put this here... ";
    cout << "instead of here.";

    getch();
    // included by conio.h
    //   - Waits for keyboard input and the continues...
    //   - Shows nothing on the screen...

    return 0;
}