OOP Hello World

// File prog.cpp - main entry point:

int main() {
    HelloWorld helloWorld;
    helloWorld.sayHello();
    return 0;
}

// File helloworld.h - class header File
#ifndef HELLOWORLD_H // Prvent this file from being loaded twice
#define HELLOWORLD_H

class HelloWorld {
public:
    HelloWorld();                   // Default constructor
    HelloWorld(const HelloWorld&);  // copy constructer
    ~HelloWorld();                  // Destructor
    void sayHello();                // Some instant method
};
#endif

// File helloworld.cpp - class code File
#include <iostream>

HelloWorld::HelloWorld() {} // nothing to init in this case
HelloWorld::HelloWorld(const HelloWorld&) {} // no stuff here either
HelloWorld::~HelloWorld() {} // no code to be executed on destruct
void HelloWorld::sayHello() {
    std::cout << "Hello World" << std::endl;
}