De-referencing Pointers : De-reference Operator (*)

The de-reference operator ( * )  :

One of the most confusing operator in pointer notation is the use of the operator ( * ) asterisk. The meaning of the symbol (*) changes at following different situations:
i) when we declare a pointer variable
ii)when we try to read a value present at the address which is held by a pointer variable.

Let us understand the above two scenarios :
i) when we declare the pointer variable we are in habit to write :

  int * p ; // [ here the * only indicates that p is a pointer variable] 

ii) When we read a value from an address:

Execute the following and see which of the two lines are giving same output:
main( )
{

 int a , *ptr ;

 a = 30 ;

 ptr = &a;

 cout<<a << "\n";

 cout<<&a << "\n";

 cout<<*ptr<<"\n";

 cout<<ptr<<"\n";

 getch( );

}