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Queue=>Double ended queue #32

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Queue=>Double ended queue #32

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241 changes: 241 additions & 0 deletions Queue=>Double ended queue
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Original file line number Diff line number Diff line change
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#include<stdio.h>
#include<conio.h>

void insertAtBeginning(int);
void insertAtEnd(int);
void insertAtAfter(int,int);
void deleteBeginning();
void deleteEnd();
void deleteSpecific(int);
void display();

struct Node
{
int data;
struct Node *previous, *next;
}*head = NULL;

void main()
{
int choice1, choice2, value, location;
clrscr();
while(1)
{
printf("\n*********** MENU *************\n");
printf("1. Insert\n2. Delete\n3. Display\n4. Exit\nEnter your choice: ");
scanf("%d",&choice1);
switch()
{
case 1: printf("Enter the value to be inserted: ");
scanf("%d",&value);
while(1)
{
printf("\nSelect from the following Inserting options\n");
printf("1. At Beginning\n2. At End\n3. After a Node\n4. Cancel\nEnter your choice: ");
scanf("%d",&choice2);
switch(choice2)
{
case 1: insertAtBeginning(value);
break;
case 2: insertAtEnd(value);
break;
case 3: printf("Enter the location after which you want to insert: ");
scanf("%d",&location);
insertAfter(value,location);
break;
case 4: goto EndSwitch;
default: printf("\nPlease select correct Inserting option!!!\n");
}
}
case 2: while(1)
{
printf("\nSelect from the following Deleting options\n");
printf("1. At Beginning\n2. At End\n3. Specific Node\n4. Cancel\nEnter your choice: ");
scanf("%d",&choice2);
switch(choice2)
{
case 1: deleteBeginning();
break;
case 2: deleteEnd();
break;
case 3: printf("Enter the Node value to be deleted: ");
scanf("%d",&location);
deleteSpecic(location);
break;
case 4: goto EndSwitch;
default: printf("\nPlease select correct Deleting option!!!\n");
}
}
EndSwitch: break;
case 3: display();
break;
case 4: exit(0);
default: printf("\nPlease select correct option!!!");
}
}
}

void insertAtBeginning(int value)
{
struct Node *newNode;
newNode = (struct Node*)malloc(sizeof(struct Node));
newNode -> data = value;
newNode -> previous = NULL;
if(head == NULL)
{
newNode -> next = NULL;
head = newNode;
}
else
{
newNode -> next = head;
head = newNode;
}
printf("\nInsertion success!!!");
}
void insertAtEnd(int value)
{
struct Node *newNode;
newNode = (struct Node*)malloc(sizeof(struct Node));
newNode -> data = value;
newNode -> next = NULL;
if(head == NULL)
{
newNode -> previous = NULL;
head = newNode;
}
else
{
struct Node *temp = head;
while(temp -> next != NULL)
temp = temp -> next;
temp -> next = newNode;
newNode -> previous = temp;
}
printf("\nInsertion success!!!");
}
void insertAfter(int value, int location)
{
struct Node *newNode;
newNode = (struct Node*)malloc(sizeof(struct Node));
newNode -> data = value;
if(head == NULL)
{
newNode -> previous = newNode -> next = NULL;
head = newNode;
}
else
{
struct Node *temp1 = head, temp2;
while(temp1 -> data != location)
{
if(temp1 -> next == NULL)
{
printf("Given node is not found in the list!!!");
goto EndFunction;
}
else
{
temp1 = temp1 -> next;
}
}
temp2 = temp1 -> next;
temp1 -> next = newNode;
newNode -> previous = temp1;
newNode -> next = temp2;
temp2 -> previous = newNode;
printf("\nInsertion success!!!");
}
EndFunction:
}
void deleteBeginning()
{
if(head == NULL)
printf("List is Empty!!! Deletion not possible!!!");
else
{
struct Node *temp = head;
if(temp -> previous == temp -> next)
{
head = NULL;
free(temp);
}
else{
head = temp -> next;
head -> previous = NULL;
free(temp);
}
printf("\nDeletion success!!!");
}
}
void deleteEnd()
{
if(head == NULL)
printf("List is Empty!!! Deletion not possible!!!");
else
{
struct Node *temp = head;
if(temp -> previous == temp -> next)
{
head = NULL;
free(temp);
}
else{
while(temp -> next != NULL)
temp = temp -> next;
temp -> previous -> next = NULL;
free(temp);
}
printf("\nDeletion success!!!");
}
}
void deleteSpecific(int delValue)
{
if(head == NULL)
printf("List is Empty!!! Deletion not possible!!!");
else
{
struct Node *temp = head;
while(temp -> data != delValue)
{
if(temp -> next == NULL)
{
printf("\nGiven node is not found in the list!!!");
goto FuctionEnd;
}
else
{
temp = temp -> next;
}
}
if(temp == head)
{
head = NULL;
free(temp);
}
else
{
temp -> previous -> next = temp -> next;
free(temp);
}
printf("\nDeletion success!!!");
}
FuctionEnd:
}
void display()
{
if(head == NULL)
printf("\nList is Empty!!!");
else
{
struct Node *temp = head;
printf("\nList elements are: \n");
printf("NULL <--- ");
while(temp -> next != NULL)
{
printf("%d <===> ",temp -> data);
}
printf("%d ---> NULL", temp -> data);
}
}
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