structure lab 9

#include<stdio.h>
struct date
{
    int day;
    int month;
    int year;
};
struct address
{
    int flat;
    int house;
    char road[5];
    char area[10];
};
struct student
{
    char name[50];
    int stdid;
    struct date dob;
    struct address address;
    char dept[3];
    float cgpa;
    struct student *s1;
    struct student *s2;
    struct student *s3;
};
int main()
{
    struct student person,roommate1,roommate2,roommate3;

    person.s1=&roommate1;
    person.s2=&roommate2;
    person.s3=&roommate3;

    roommate1.s1=&person;
    roommate1.s2=&roommate2;
    roommate1.s3=&roommate3;

    roommate2.s1=&person;
    roommate2.s2=&roommate1;
    roommate2.s3=&roommate2;

    roommate3.s1=&person;
    roommate3.s2=&roommate1;
    roommate3.s3=&roommate2;

    strcpy(person.name,"Sadaf Halim");
    person.stdid=144422;
    person.dob.day=7;
    person.dob.month=3;
    person.dob.year=1995;
    person.address.flat=105;
    person.address.house=26;
    strcpy(person.address.road,"8A");
    strcpy(person.address.area,"Dhanmondi");
    strcpy(person.dept,"CSE");
    person.cgpa=3.91;

    strcpy(roommate1.name,"abc");
    roommate1.stdid=144421;
    roommate1.dob.day=2;
    roommate1.dob.month=3;
    roommate1.dob.year=1995;
    roommate1.address.flat=106;
    roommate1.address.house=28;
    strcpy(roommate1.address.road,"8b");
    strcpy(roommate1.address.area,"Dhanmondi");
    strcpy(roommate1.dept,"CSE");
    roommate1.cgpa=3.92;

    strcpy(roommate2.name,"def");
    roommate2.stdid=144454;
    roommate2.dob.day=2;
    roommate2.dob.month=8;
    roommate2.dob.year=1995;
    roommate2.address.flat=102;
    roommate2.address.house=29;
    strcpy(roommate2.address.road,"8g");
    strcpy(roommate2.address.area,"Dhanmondi");
    strcpy(roommate2.dept,"CSE");
    roommate1.cgpa=3.96;

    strcpy(roommate3.name,"ghi");
    roommate3.stdid=144434;
    roommate3.dob.day=2;
    roommate3.dob.month=6;
    roommate3.dob.year=1995;
    roommate3.address.flat=102;
    roommate3.address.house=20;
    strcpy(roommate3.address.road,"8h");
    strcpy(roommate3.address.area,"Dhanmondi");
    strcpy(roommate3.dept,"CSE");
    roommate3.cgpa=3.87;

    printf("%s\n",person.name);
    printf("%d\n",person.stdid);
    printf("%d ",person.dob.day);
    printf("%d ",person.dob.month);
    printf("%d\n",person.dob.year);
    printf("%d ",person.address.flat);
    printf("%d ",person.address.house);
    printf("%s ",person.address.road);
    printf("%s\n",person.address.area);
    printf("%s\n",person.dept);
    printf("%f\n",person.cgpa);
    printf("1.%s %d\n",person.s1->name,person.s1->stdid);
    printf("2.%s %d\n",person.s2->name,person.s2->stdid);
    printf("3.%s %d\n",person.s3->name,person.s3->stdid);
}