Modify the Linked List such that All Even Numbers appear before all
the Odd Numbers in the Modified Linked List
#include
#include
#include
struct node
{
int num;
struct node *next;
};
void create(struct node **);
void generate_evenodd(struct node *, struct node**);
void release(struct node **);
void display(struct node *);
int main()
{
struct node *p = NULL, *q = NULL;
int key, result;
printf("Enter data into the list\n");
create(&p);
printf("Displaying the nodes in the list:\n");
display(p);
generate_evenodd(p, &q);
printf("Displaying the list with even and then odd:\n");
display(q);
release(&p);
return 0;
}
void generate_evenodd(struct node *list, struct node **head)
{
struct node *even = NULL, *odd = NULL, *temp;
struct node *reven, *rodd;
while (list != NULL)
{
temp = (struct node *)malloc(sizeof(struct node));
temp->num = list->num;
temp->next = NULL;
if (list->num % 2 == 0)
{
if (even == NULL)
{
even = temp;
}
else
{
reven->next = temp;
}
reven = temp;
}
else
{
if (odd == NULL)
{
odd = temp;
}
else
{
rodd->next = temp;
}
rodd = temp;
}
list = list->next;
}
reven->next = odd;
*head = even;
}
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 *p)
{
while (p != NULL)
{
printf("%d\t", p->num);
p = p->next;
}
printf("\n");
}
void release(struct node **head)
{
struct node *temp = *head;
*head = (*head)->next;
while ((*head) != NULL)
{
free(temp);
temp = *head;
(*head) = (*head)->next;
}
}
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: 4
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
Displaying the nodes in the list:
1 2 3 4 5 6
Displaying the list with even and then odd:
2 4 6 1 3 5
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