/* Structures */

// A structure cannot, however, contain an instance of itself.

// A structure containing a member that is a pointer to the same structure type

/// is reffered to as a self-referential structure.

// Member access operators : . (dot operator), -> (arrow operator).

// The dot operator accesses a structure or class member via the variable name for

/// the object or via a reference to the object.

// The arrow operator accesses a member of an object to a class or structure via

/// a pointer to that object.

// The only difference between a structure and a class is that: The default

/// access level assigned to members of struct is public while the default access

/// level assigned to a class is private.

#include <stdio.h>

struct Structure_Tag // Structure-tag is the new data type from now on.

{

int Num1;

int Num2;

};

struct UDT

{

int Num1;

int Num2;

};

UDT st1;

int main()

{

st1.Num1 = 10;

st1.Num2 = 20;

printf("st1.Num1 == %d.\nst1.Num2 == %d.\n",st1.Num1,st1.Num2);

UDT *ptr;

ptr = &st1;

printf("ptr->Num1 == %d.\n(*ptr).Num2 == %d\n",(*ptr).Num1,ptr->Num2);

return 0;

}