#include <iostream> // for std::cout, std::cerr, std::cin, std::getline
#include <vector> // for std::vector

using namespace std; // never do this in a header file

int main(int argc, char *argv[]) {
    // copy the arguments to a vector of strings (vector is a dynamic array on the heap)
    vector<string> args(argv, argv + argc);
    string name; // this is a string on the stack

    if (args.size() > 1 && args[1] == "--help") {
        cout << "USAGE: " << argv[0] << endl; // print a line to stdout

        return 0; // exit with code 0 (success)
    } else {
        cerr << "ERROR: unknown option" << endl; // print a line to stderr

        return 1; // exit with code 1 (error)
    }

    cout << "What is your name?" << endl; // print a line to stdout

    getline(cin, name); // read a line from stdin into name

    cout << "Hello, " << name << endl; // print a line to stdout
} // end of main, return 0 is implicit here (success)