PROGRAM TO IMPLEMENT LINEAR QUEUE USING LINKED LIST
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/*****************************************************/
/*PROGRAM TO IMPLEMENT LINEAR QUEUE USING LINKED LIST*/
/*****************************************************/
#include < stdio.h>
#include < conio.h>
#include < malloc.h>
#include < process.h>
#include < ctype.h>
struct linear_queue
{
int info;
struct linear_queue *next;
}*front,*rear,*newnode,*ptr;
void menu();
void display();
int underflow();
void enqueue(int);
void dequeue();
void main()
{
clrscr();
menu();
}
void menu()
{
int choice,item;
printf("MENU");
printf("\n1. Insert into the queue");
printf("\n2. Delete from queue");
printf("\n3. Display");
printf("\n4. Exit");
printf("\nEnter your choice: ");
scanf("%d",&choice);
switch(choice)
{
case 1:
clrscr();
printf("\nEnter the item tobe inserted: ");
scanf("%d",&item);
enqueue(item);
clrscr();
printf("\nAfter inserting queue is:\n");
display();
getch();
clrscr();
menu();
break;
case 2:
clrscr();
if(underflow()==1)
{
dequeue();
if(underflow()==1)
{
printf("\nAfter deletion queue is:\n");
display();
}
}
getch();
clrscr();
menu();
break;
case 3:
clrscr();
if(underflow()==1)
{
printf("The queue is:\n");
display();
}
getch();
clrscr();
menu();
break;
case 4:
exit(1);
default:
clrscr();
printf("Your choice is wrong\n\n");
menu();
}
}
int underflow()
{
if((front==NULL)&&(rear==NULL))
{
printf("\nQueue is empty");
return(0);
}
else
{
return(1);
}
}
void enqueue(int item)
{
newnode=(struct linear_queue*)malloc(sizeof(struct linear_queue));
newnode->info=item;
if((front==NULL)&&(rear==NULL))
{
front=newnode;
rear=newnode;
newnode->next=NULL;
}
else
{
rear->next=newnode;
newnode->next=NULL;
rear=newnode;
}
}
void dequeue()
{
if(front==rear)
{
front=NULL;
rear=NULL;
}
else
{
front=front->next;
}
}
void display()
{
int i;
ptr=front;
i=1;
while(ptr!=NULL)
{
printf("\nNode %d : %d",i,ptr->info);
ptr=ptr->next;
i++;
}
}
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