Nested Structure in C

A structure can be nested within another structure by declaring structure variable inside other structure.

struct address
{
    char phone[15],city[15];
    int pincode;
};

struct employee
{
        int id;
        struct address a;
};

int main()
{
        struct employee e1 = {1,"1234567","ABC","39"};

        printf("%d\t%s\t%s\t%d",e1.id,e1.a.phone,e1.a.city,e1.a.pincode);

        return 0;
}

Variable of address structure is nested within employee structure.We access the members of nested structure using . (dot operator) twice.

structure variable.nested structure variable.nested structure member

e1.a.phone