Constructor tests

Testing: Cons o1a(5);
5
Testing: Cons * o1b = new Cons(5);
5
Testing: Cons o3a();
request for member 'Show' in 'o3a', which is of non-class type 'Cons()'
Testing: Cons * o3b = new Cons();
-1
Testing: Cons o2a;
-1
Testing:  Cons * o2b = new Cons;
-1