Embedded structure

We can define structure within the structure also.

struct Employee
{
    int id;
    char name[20];
    struct Date
    {
        int dd;
        int mm;
        int yyyy;
    }doj;
}emp1;

Accessing Nested Structure

We can access the member of nested structure by Outer_Structure.Nested_Structure.member as given below :

emp1.doj.dd
emp1.doj.mm
emp1.doj.yyyy

Example of nested structures

#include <stdio.h>
#include <string.h>
struct Employee
{
    int id;
    char name[20];

    struct Date
    {
        int dd;
        int mm;
        int yyyy;
    }doj;
}e1;
int main( )
{
    //storing employee information
    e1.id=1;
    //copying string into char array
    strcpy(e1.name, "xyz");

    e1.doj.dd=26;
    e1.doj.mm=12;
    e1.doj.yyyy=2014;

    //printing employee information
    printf( "employee id : %d\n", e1.id);
    printf( "employee name : %s\n", e1.name);
    printf( "employee date of joining (dd/mm/yyyy) : %d/%d/%d\n", e1.doj.dd,e1.doj.mm,e1.doj.yyyy);
    return 0;
}

Output :

employee id : 1
employee name : xyz
employee date of joining (dd/mm/yyyy) : 26/12/2014