Code:
#include stdio.h
#include stdlib.h
struct node
{
int num;
struct node *next;
};
int create(struct node **);
int palin_check (struct node *, int);
void release(struct node **);
int main()
{
struct node *p = NULL;
int result, count;
printf("Enter data into the list\n");
count = create(&p);
result = palin_check(p, count);
if (result == 1)
{
printf("The linked list is a palindrome.\n");
}
else
{
printf("The linked list is not a palindrome.\n");
}
release (&p);
return 0;
}
int palin_check (struct node *p, int count)
{
int i = 0, j;
struct node *front, *rear;
while (i != count / 2)
{
front = rear = p;
for (j = 0; j < i; j++)
{
front = front->next;
}
for (j = 0; j < count - (i + 1); j++)
{
rear = rear->next;
}
if (front->num != rear->num)
{
return 0;
}
else
{
i++;
}
}
return 1;
}
int create (struct node **head)
{
int c, ch, count = 0;
struct node *temp;
do
{
printf("Enter number: ");
scanf("%d", &c);
count++;
temp = (struct node *)malloc(sizeof(struct node));
temp->num = c;
temp->next = *head;
*head = temp;
printf("Do you wish to continue [1/0]: ");
scanf("%d", &ch);
}while (ch != 0);
printf("\n");
return count;
}
void release (struct node **head)
{
struct node *temp = *head;
while ((*head) != NULL)
{
(*head) = (*head)->next;
free(temp);
temp = *head;
}
}
Output:
Enter data into the list
Enter number: 1
Do you wish to continue [1/0]: 1
Enter number: 2
Do you wish to continue [1/0]: 1
Enter number: 3
Do you wish to continue [1/0]: 1
Enter number: 3
Do you wish to continue [1/0]: 1
Enter number: 2
Do you wish to continue [1/0]: 1
Enter number: 1
Do you wish to continue [1/0]: 0
The linked list is a palindrome.
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