why we are using this lendthy method?

Question

#include <iostream>
using namespace std;

class MyClass
{
public:
MyClass();
void myPrint();
};

MyClass::MyClass() {
}
void MyClass::myPrint() {
cout <<"Hello"<<endl;
}

int main() {
MyClass obj;
obj.myPrint();
}

we can also use only-
#include<iostream>
using namespace std;

int main() {
cout << "Hello World"<<endl;
return 0;
}

Answer 1

I think it's just an example of implementing a class in C++ and not the real-world implementation