Code:
#include stdio.h
#include stdlib.h
struct node
{
int num;
struct node *next;
};
void create(struct node **);
void display(struct node *);
int survivor(struct node **, int);
int main()
{
struct node *head = NULL;
int survive, skip;
create(&head);
printf("The persons in circular list are:\n");
display(head);
printf("Enter the number of persons to be skipped: ");
scanf("%d", &skip);
survive = survivor(&head, skip);
printf("The person to survive is : %d\n", survive);
free(head);
return 0;
}
int survivor(struct node **head, int k)
{
struct node *p, *q;
int i;
q = p = *head;
while (p->next != p)
{
for (i = 0; i < k - 1; i++)
{
q = p;
p = p->next;
}
q->next = p->next;
printf("%d has been killed.\n", p->num);
free(p);
p = q->next;
}
*head = p;
return (p->num);
}
void create (struct node **head)
{
struct node *temp, *rear;
int a, ch;
do
{
printf("Enter a number: ");
scanf("%d", &a);
temp = (struct node *)malloc(sizeof(struct node));
temp->num = a;
temp->next = NULL;
if (*head == NULL)
{
*head = temp;
}
else
{
rear->next = temp;
}
rear = temp;
printf("Do you want to add a number [1/0]? ");
scanf("%d", &ch);
} while (ch != 0);
rear->next = *head;
}
void display(struct node *head)
{
struct node *temp;
temp = head;
printf("%d ", temp->num);
temp = temp->next;
while (head != temp)
{
printf("%d ", temp->num);
temp = temp->next;
}
printf("\n");
}
Output:
Enter a number: 1
Do you want to add a number [1/0]? 1
Enter a number: 2
Do you want to add a number [1/0]? 1
Enter a number: 3
Do you want to add a number [1/0]? 1
Enter a number: 4
Do you want to add a number [1/0]? 1
Enter a number: 5
Do you want to add a number [1/0]? 1
Enter a number: 6
Do you want to add a number [1/0]? 1
Enter a number: 7
Do you want to add a number [1/0]? 0
The persons in circular list are:
1 2 3 4 5 6 7
Enter the number of persons to be skipped: 3
3 has been killed.
6 has been killed.
2 has been killed.
7 has been killed.
5 has been killed.
1 has been killed.
The person to survive is : 4
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