#include <iostream>
using namespace std;

class A
{
   int a,b,c;
   const int d;
   int& e;
public:
   A();
   A(int&);
};

 int G = -1;

int main()
{
   int j= 33;
   A apple(j);
   A atom;
}


A::A(int& arg)
:  a(3), b(4), c(5), d(18)//, e(arg)
{
   // body of the constructor
  // d = 18;
  e = arg;
}


A::A()
:  a(3), b(4), c(5), // constructor initialization list, constructor initializers
   d(18), e(G)
{ }