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C-/C++-Quelltext

//main.cpp
#include "Application.hpp"

int main(int argc, char* argv[])
{
    std::vector<std::string> arguments;
    arguments.reserve(argc - 1);
    for(int i = 1; i < argc; ++i)
        arguments.push_back(argv[i]);

    Application app;
    return app.run(arguments);
}

C-/C++-Quelltext

//Application.hpp
#pragma once

#include <string>
#include <vector>

class Application
{
    int run(const std::vector<std::string>& arguments) noexcept;
};

C-/C++-Quelltext

//Application.cpp
#include "Application.hpp"
#include <iostream>

int Application::run(const std::vector<std::string>& ) noexcept
{
    std::cout << "Hallo Welt!" << std::endl;

    return 0;
}

C-/C++-Quelltext

#include <iostream>

class Person
{
public:
    Person(int j=0) : i(j)
    { }

    operator int&()
    { return age; }
    
    friend std::ostream& operator<<(std::ostream& os, const Person& in)
    { return os << in.age; }
    
    friend std::istream& operator>>(std::istream& is, Person& in)
    { return is >> in.age; }
    
private:
    int age;
};

int main()
{
    Person i0(5);
    std::cout << "Altes Alter: " << i0 << std::endl;
    std::cout << "Neues Alter: ";
    std::cin >> i0;
    std::cin.ignore();
    std::cout << "Die neue Alter ist " << i0 << std::endl;
}