C++ Variables

/// Tutorials found on BrandonHok.com
#include <iostream>

int main()

{

    // [Section 1]
    // Try running this section set first. Do not add any other code yet.
    // What happens when you erase std::cin.get();?
    std::cout << "What do you think cout does?\n";
    std::cout << "Try pressing a number now\n";
    std::cin.get();

    // [Section 2]
    // Add these statements now.
    // We are introducing what is a variable now. Basically like in math x = o
    // What is variable222?
    // What happened? Do you know why?
    int variable1 = 777;
    int variable222;

    // [Section 3]
    // What happened here? Why did the number 777 appear?
    // What do you think \n does? Try erasing it and see what happens.
    std::cout << variable1 << "\n";
    std::cout << "End of Section 3\n";
    system("pause");

    // [Section 4]
    // What do you think cin do?
    // What do you think cout do?
    // What do you think << and >> do?
    // What do you think std::endl; does? Try erasing it and see what happens.
    std::cin >> variable222;
    std::cout << variable222 << "\nWhat do you think cout and cin does?\n" << std::endl;
    std::cout << "End of Statement 4" << std::endl;
    system("pause");

    // [Statements 5]
    // What do you think happened here?
    // What happened to variable3 and variable4 in the beginning and end?
    int variable3;
    int variable4;
    std::cin >> variable3 >> variable4;
    std::cout << variable3 << " This is variable3" << std::endl;
    std::cout << "Try a 3 digit number now" << std::endl;
    std::cin >> variable3 >> variable4;
    std::cout << variable3 + variable4 << std::endl;
    system("pause");

    // Summarize the lesson on paper. What are the major concepts today?
    // What do you think this statement does? You may want to google it and learn more about it.
    return 0;
}