Project 1 - Creation of user defined data type to implement the user interfaces for working with ‘Set’ (Mathematical Set theory)

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>

// Link list node
struct Node
{
int data;
struct Node* next;
};

/* A utility function to insert a
node at the beginning ofa linked list*/
void push(struct Node** head_ref,
int new_data);

/* A utility function to check if
given data is present in a list */
bool isPresent(struct Node* head,
int data);

/* Function to get union of two
linked lists head1 and head2 */
struct Node* getUnion(struct Node* head1,
struct Node* head2)
{
struct Node* result = NULL;
struct Node *t1 = head1, *t2 = head2;

// Insert all elements of
// list1 to the result list
while (t1 != NULL)
{
push(&result, t1->data);
t1 = t1->next;
}

// Insert those elements of list2
// which are not present in result list
while (t2 != NULL)
{
if (!isPresent(result, t2->data))
push(&result, t2->data);
t2 = t2->next;
}

return result;
}

/* Function to get intersection of
two linked lists head1 and head2 */
struct Node* getIntersection(struct Node* head1,
struct Node* head2)
{
struct Node* result = NULL;
struct Node* t1 = head1;

// Traverse list1 and search each element
// of it in list2. If the element is
// present in list 2, then insert the
// element to result
while (t1 != NULL)
{
if (isPresent(head2, t1->data))
push(&result, t1->data);
t1 = t1->next;
}

return result;
}

/* A utility function to insert a
node at the beginning of a linked list*/
void push(struct Node** head_ref,
int new_data)
{
// Allocate node
struct Node* new_node =
(struct Node*)malloc(
sizeof(struct Node));

// Put in the data
new_node->data = new_data;

/* link the old list off the
new node */
new_node->next = (*head_ref);

/* Move the head to point to the
new node */
(*head_ref) = new_node;
}

/* A utility function to print a
linked list*/
void printList(struct Node* node)
{
while (node != NULL)
{
printf("%d ", node->data);
node = node->next;
}
}

/* A utility function that returns true
if data is present in linked list
else return false */
bool isPresent(struct Node* head,
int data)
{
struct Node* t = head;
while (t != NULL)
{
if (t->data == data)
return 1;
t = t->next;
}
return 0;
}

// Driver code
int main()
{
// Start with the empty list
struct Node* head1 = NULL;
struct Node* head2 = NULL;
struct Node* intersecn = NULL;
struct Node* unin = NULL;

/* Create a linked lists
10->15->5->20 */
push(&head1, 12);
push(&head1, 3);
push(&head1, 13);
push(&head1, 30);

/* Create a linked lits
8->4->2->10 */
push(&head2, 12);
push(&head2, 3);
push(&head2, 4);
push(&head2, 8);

intersecn = getIntersection(head1,
head2);
unin = getUnion(head1, head2);

printf("First list is ");
printList(head1);

printf("\nSecond list is ");
printList(head2);

printf("\nIntersection list is ");
printList(intersecn);

printf("\nUnion list is ");
printList(unin);

return 0;
}