#include <iostream>
#include <string>

class Hello{
private:
    std::string hello;
public:
    Hello();

    void sentence();
};

Hello::Hello(){
    this->hello = "Hello World!";
}

void Hello::sentence(){
    std::cout << this->hello;
}

int main()
{
    //std::cout << "Hello World!";
    Hello test;
    test.sentence();
    return 0;
}