How to Declaring Nested Structures in c++

Like other user defined data types, a structure can also include another structure, as its member, in its definition. A structure defined within another structure is known as a nested structure.

To understand the concept of nested structures, consider this example.

Example: A code segment to demonstrate nested structures

struct date // inner structure definition {
  int day;
  int month;
  int year;
};
 struct employee // outer structure {
   int emp_no ;
   char name [10];
   date dob ; //inner structure
};

In this example, the structure employee contains a structure variable of date type struct1,lre as one of its member. Now, the members of employee can be initialized using either of these statements.

employee emp1={101,"Smith",{22,4,1975}}; or
employee emp1= {101, “Smith" ,22,4,1975} ;

The members of a nested structure can be accessed using these statements.

cout<<emp1.dob.month; //display month of emp1
emp1.dob.day=26; //assign value to day
//member of emp1