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| #include<stdio.h>
#include<stdlib.h>
struct node
{
int data;
struct node *next;
};
struct node *head;
void beginsert();
void lastinsert();
void randominsert();
void begin_delete();
void last_delete();
void random_delete();
void display();
void search();
int main()
{
int choice = 0;
while (choice != 7)
{
printf("*********Main Menu*********\n");
printf("Choose one option from the following list ...\n");
printf("===============================================\n");
printf("1.Insert in begining\n2.Insert at last\n");
printf("3.Delete from Beginning\n4.Delete from last\n");
printf("5.Search for an element\n6.Show\n7.Exit\n");
printf("Enter your choice?\n");
scanf("%d", &choice);
switch (choice)
{
case 1:
beginsert();
break;
case 2:
lastinsert();
break;
case 3:
begin_delete();
break;
case 4:
last_delete();
break;
case 5:
search();
break;
case 6:
display();
break;
case 7:
exit(0);
break;
default:
printf("Please enter valid choice..");
}
}
}
void beginsert()
{
struct node *ptr, *temp;
int item;
ptr = (struct node *)malloc(sizeof(struct node));
if (ptr == NULL)
{
printf("OVERFLOW");
}
else
{
printf("Enter the node data?");
scanf("%d", &item);
ptr->data = item;
if (head == NULL)
{
head = ptr;
ptr->next = head;
}
else
{
temp = head;
while (temp->next != head)
temp = temp->next;
ptr->next = head;
temp->next = ptr;
head = ptr;
}
printf("node inserted\n");
}
}
void lastinsert()
{
struct node *ptr, *temp;
int item;
ptr = (struct node *)malloc(sizeof(struct node));
if (ptr == NULL)
{
printf("OVERFLOW\n");
}
else
{
printf("Enter Data?");
scanf("%d", &item);
ptr->data = item;
if (head == NULL)
{
head = ptr;
ptr->next = head;
}
else
{
temp = head;
while (temp->next != head)
{
temp = temp->next;
}
temp->next = ptr;
ptr->next = head;
}
printf("node inserted\n");
}
}
void begin_delete()
{
struct node *ptr;
if (head == NULL)
{
printf("UNDERFLOW");
}
else if (head->next == head)
{
head = NULL;
free(head);
printf("node deleted\n");
}
else
{
ptr = head;
while (ptr->next != head)
ptr = ptr->next;
ptr->next = head->next;
free(head);
head = ptr->next;
printf("node deleted\n");
}
}
void last_delete()
{
struct node *ptr, *preptr;
if (head == NULL)
{
printf("UNDERFLOW");
}
else if (head->next == head)
{
head = NULL;
free(head);
printf("node deleted\n");
}
else
{
ptr = head;
while (ptr->next != head)
{
preptr = ptr;
ptr = ptr->next;
}
preptr->next = ptr->next;
free(ptr);
printf("node deleted\n");
}
}
void search()
{
struct node *ptr;
int item, i = 0, flag = 1;
ptr = head;
if (ptr == NULL)
{
printf("Empty List\n");
}
else
{
printf("Enter item which you want to search?\n");
scanf("%d", &item);
if (head->data == item)
{
printf("item found at location %d", i + 1);
flag = 0;
}
else
{
while (ptr->next != head)
{
if (ptr->data == item)
{
printf("item found at location %d ", i + 1);
flag = 0;
break;
}
else
{
flag = 1;
}
i++;
ptr = ptr->next;
}
}
if (flag != 0)
{
printf("Item not found\n");
}
}
}
void display()
{
struct node *ptr;
ptr = head;
if (head == NULL)
{
printf("nothing to print");
}
else
{
printf("printing values ... \n");
while (ptr->next != head)
{
printf("%d\n", ptr->data);
ptr = ptr->next;
}
printf("%d\n", ptr->data);
}
}
|
