#include<iostream>
using namespace std;

namespace test{
class MyClass{
      public:
           int a;
           void print_a() {
               cout<<a;
           }

      MyClass(){a=0;}
      MyClass(int my_a) {a=my_a;}
};
}
int main(void) {
     //statikos tropos klisis
     test::MyClass x;//x(3) dinei 3//test:: giati h myclass anikei se namespace{} pleon
     cout<< x.a <<endl;
     x.print_a();
     // dynamikos tropos klisis
     test::MyClass *y=new test::MyClass(3);
     cout<< y->a <<endl;
     y-> print_a();
}