Find the first Common Element
between the 2 given Linked Lists
#include
#include
#include
struct node
{
int num;
struct node *next;
};
void create(struct node **);
int find(struct node *, struct node *);
void release(struct node **);
void display(struct node *);
int main()
{
struct node *p = NULL, *q = NULL;
int result;
clrscr();
printf("Enter data into the list\n");
create(&p);
printf("Enter data into the list\n");
create(&q);
printf("Displaying list1:\n");
display(p);
printf("Displaying list2:\n");
display(q);
result = find(p, q);
if (result)
{
printf("The first matched element is %d.\n", result);
}
else
{
printf("No matching element found.\n");
}
release (&p);
return 0;
}
int find(struct node *p, struct node *q)
{
struct node *temp;
while (p != NULL)
{
temp = q;
while (temp != NULL)
{
if (temp->num == p->num)
{
return p->num;
}
temp = temp->next;
}
p = p->next;
}
return 0;
}
void create(struct node **head)
{
int c, ch;
struct node *temp, *rear;
do
{
printf("Enter number: ");
scanf("%d", &c);
temp = (struct node *)malloc(sizeof(struct node));
temp->num = c;
temp->next = NULL;
if (*head == NULL)
{
*head = temp;
}
else
{
rear->next = temp;
}
rear = temp;
printf("Do you wish to continue [1/0]: ");
scanf("%d", &ch);
} while (ch != 0);
printf("\n");
}
void display(struct node *head)
{
while (head != NULL)
{
printf("%d\t", head->num);
head = head->next;
}
printf("\n");
}
void release(struct node **head)
{
struct node *temp;
while ((*head) != NULL)
{
temp = *head;
(*head) = (*head)->next;
free(temp);
}
}
Output
Enter data into the list1
Enter number: 2
Do you wish to continue [1/0]: 1
Enter number: 8
Do you wish to continue [1/0]: 1
Enter number: 5
Do you wish to continue [1/0]: 1
Enter number: 6
Do you wish to continue [1/0]: 0
Enter data into the list2
Enter number: 3
Do you wish to continue [1/0]: 1
Enter number: 5
Do you wish to continue [1/0]: 1
Enter number: 9
Do you wish to continue [1/0]: 0
Displaying list1:
2 8 5 6
Displaying list2:
3 5 9
The first matched element is 5.
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