Qprgs

1) ‘C’ program
/*************************************************************
Program for implementing the Queue using arrays

*************************************************************/
#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#define size 5
struct queue
{
int que[size];
int front,rear;
}Q;
/*
The Qfull Function
Input:none
Output:1 or 0 for q full or not
Called By:main
Calls:none
*/
Qfull()
{
if(Q.rear >=size–1)
return 1;
else
return 0;
}
/*
The insert Function
Input:item -which is to be inserted in the Q
Output:rear value
Called By:main
Calls:none
*/
int insert(int item)
{
if(Q.front == –1)
Q.front++;
Q.que[++Q.rear] = item;
return Q.rear;
}
int Qempty()
{
if((Q.front == – 1) || (Q.front > Q.rear))
return 1;
else
return 0;
}
/*
The delete Function
Input:none
Output:front value
Called By:main

Calls:none
*/
int delete()
{
int item;
item = Q.que[Q.front];
Q.front++;
printf(―n The deleted item is %d‖,item);
return Q.front;
}
/*
The display Function
Input:none
Output:none
Called By:main
Calls:none
*/
void display()
{
int i;
for(i=Q.front;i<=Q.rear;i++)
printf(― %d‖,Q.que[i]);
}
void main(void)
{
int choice,item;
char ans;
clrscr();
Q.front = –1;
Q.rear = –1;
do
{
printf(―n Main Menu‖);
printf(―n1.Insertn2.Deleten3.Display‖);
printf(―n Enter Your Choice‖);
scanf(―%d‖,&choice);
switch(choice)
{
case 1:if(Qfull()) //checking for Queue overflow
printf(―n Can not insert the element‖);
else
{
printf(―n Enter The number to be inserted‖);
scanf(―%d‖,&item);
insert(item);
}
break;
case 2:if(Qempty())
printf(―n Queue Underflow!!‖);
else
delete();
break;
case 3:if(Qempty())
printf(―nQueue Is Empty!‖);

else
display();
break;
default:printf(―n Wrong choice!‖);
break;
}
printf(―n Do You Want to continue?‖);
ans =getche();
}while(ans ==‘Y‘||ans ==‘y‘);
}
/********************** End Of Program ***********************/
2) ‘C’ program

/*************************************************************
Program For circular queue using arrays.It performs the basic
operations such as insertion,deletion of the elements by taking
care of queue Full and queue Empty conditions.The appropriate
display is for displaying the queue
*************************************************************/
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#define size 5
int queue[size];
int front=–1;
int rear =0;
/*
The qFull Function
Input:none
Output:returns 1 or 0 for q.full or not
Called By:add
Calls:none
*/
int qFull()
{
if(front==(rear+1)%size)
return 1;
else
return 0;
}
/*
The qEmpty Function
Input:none
Output:returns 1 or 0 for q.empty or not
Called By:delete and display
Calls:none
*/
int qEmpty()
{
if(front ==–1)
return 1;
else
return 0;
}

/*
The add Function
Input:the element to be inserted
Output:none
Called By:main
Calls:qFull
*/
void add(int Item)
{
if(qFull())
printf(―n The circular Queue is full!‖);
else
{
if(front ==–1)
front=rear=0;
else
rear =(rear+1)%size;
queue[rear]=Item;
}
}
/*
The delete Function
Input:none
Output:returns the deleted element
Called By:main
Calls:qEmpty
*/
void delete()
{
int Item;
if(qEmpty())
printf(―n Queue Is Empty!‖);
else

{
Item=queue[front];
if(front ==rear)
{
front=rear=–1;
}
else
front =(front+1)%size;
printf(―n The deleted item is %d‖,Item);
}
}
/*
Input: none
Output: prints the contents of the queue
Called By:main
Calls:qEmpty
*/
void display()
{

int i;
if(qEmpty())
{
printf(―nThe Queue Is Empty‖);
return;
}
i=front;
while(i!=rear)
{
printf(― %d‖,queue[i]);
i=(i+1)%size;
}
printf(― %d‖,queue[i]);
}
/*
The main Function
Input:none
Output:none
Called By:O.S.
Calls:add,delete,display
*/
void main(void)
{
int choice,Item;
char ans;
clrscr();
do
{
printf(―n 1.Insertn2.Deleten3.Display‖);
switch(choice)
{
case 1:printf(―nEnter The element‖);
scanf(―%d‖,&Item);
add(Item);
break;
case 2:delete();
break;
case 3:display();
break;
default:exit(0);
}
printf(―n Do u want to continue?‖);
ans =getch();
}while(anvb ==‘Y‘||ans == ‗y‘);
getch();
}
/************************ End Of Main ***********************/

3)C Program
/*************************************************************
Program for implementing the Queue using one dimensional array

*************************************************************/

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#define size 20

/*data structure for multiple queue*/
struct mult_que {
int que[size];
int rear[size],front[size];
}Q;
int sz[size];/*stores sizes of individual queue*/
/*
The set_que function
Purpose:This function initialises all the front and rear positions of
individual queues.All thses queues has to be in a single dimensional
array
Input:index of the queue
Output:none,it simply initializes the locations of front and rear
Called By:main,before performing any operation on individual queue
Calls:none
*/
void set_que(int index)
{
int sum,i;
if(index==1)
{
Q.front[index]=0;
Q.rear[index]=Q.front[index]-1;
}
else
{
sum=0;
for(i=0;i<index-1;i++)
sum=sum+sz[i];
Q.front[index]=sum;
Q.rear[index]=Q.front[index]-1;/*computed the rear position
based on previous queues */
}
}
/* The Qfull Function
Purpose:to check whethe queue is full or not
Output:1 or 0 for q full or not
Called By:main
Calls:none
*/
int Qfull(int index)

{
int sum,i;
sum=0;
for(i=0;i<index;i++)
sum=sum+sz[i];
if(Q.rear[index]==sum-1)
return 1;
else
return 0;
}
/*
The insert Function
Purpose:This function if for inserting the items in the requested queue
Input:item which is to be inserted in the queue
Output:rear value
Called By:main
Calls:none
*/
void insert(int item,int index)
{
int j;
j=Q.rear[index];
Q.que[++j] = item;
Q.rear[index]=Q.rear[index]+1;
}
/*
The Qempty function
Purpose:It Checks whether the queue is empty or not
Output: returns 1 if queue is empty otherwise 0
Called By:main
Calls:none
*/
int Qempty(int index)
{
if(Q.front[index]>Q.rear[index])
return 1;
else
return 0;
}
/*
The delet Function
Purpose:for deletion of the element from the requeseted queue
Input:index of the que
Output:item which is deleted
Called By:main
Calls:none
*/
int delet(int index)
{
int item;
item = Q.que[Q.front[index]];
Q.que[Q.front[index]]=-1;
Q.front[index]++;

return item;
}
/*
Purpose:displays all the queues
Input:num which indicates total number of queues
Output:none
Called By:main
Calls:none
*/
void display(int num)
{
int index,i;
index=1;
do

{
if(Qempty(index))
printf(―n The Queue %d is Empty‖,index);
else
{
printf(―n Queue number %d is:‖,index);
for(i=Q.front[index];i<=Q.rear[index];i++)
{
if(Q.que[i]!=-1)
}
}
index++;
}while(index<=num);

}
/*
The main function
Input:none
Output:none
Called By:O.S.
Calls:set_que,Qfull,Qempty,insert,delete,display
*/
void main(void)
{
int choice,item,num,i,index;
char ans;
clrscr();
printf(―ntt Program For Multiple Queues‖);
printf(―n How many Queues do you want?‖);
scanf(―%d‖,&num);
printf(―n Enter The size of queue(Combined size of all Queues is 20)‖);
for(i=0;i<num;i++)
scanf(―%d‖,&sz[i]);
for(index=1;index<=num;index++)
set_que(index);/*initialized front and rear of each queue*/
do
{

switch(choice)
{
case 1: printf(―n Enter in which queue you wish to
insert the item?‖);
scanf(―%d‖,&index);
if(Qfull(index))
/*checking for Queue overflow*/
printf(―n Can not insert the elemnt‖);
else
{
printf(―n Enter The number to be inseted‖);
insert(item,index);
}
break;
case 2: printf(―n Enter From which queue you wish to
delete the item?‖);
scanf(―%d‖,&index);
if(Qempty(index))
printf(―n Queue Underflow!!‖);
else
{
item= delet(index);
printf(―n The deleted item is %d‖,item);
}
break;
case 3:display(num);
break;
default:printf(―n Wrong choice!‖);
break;
}
printf(―n Do You Want to continue?‖);
ans =getche();
}while(ans ==‘Y‘||ans ==‘y‘);

}
4)C Program
/*************************************************************
Program To implement Doubly ended queue using arrays

*************************************************************/
#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
#define size 5
/*Data structure for deque*/
struct queue {
int que[size];
int front,rear;
}Q;

/* The Qfull function
Input:none
Output:returns 1 if Queue is full otherwise 0
Called By:main
Calls:none
*/
int Qfull()
{
if(Q.rear==size-1)
return 1;
else
return 0;
}
/* The function
Input:Qempty
Output:none
Called By:main
Calls: none
*/
int Qempty()
{
if((Q.front>Q.rear)||(Q.front==-1&&Q.rear==-1))
return 1;
else
return 0;
}
/* The Qfull function
Input:
Output:
Called By:
Calls:
*/
int insert_rear(int item)
{
if(Q.front==-1&&Q.rear==-1)
Q.front++;
Q.que[++Q.rear]=item;
return Q.rear;
}
/* The delete_front function
Input:none
Output:returns the deleted item
Called By:main
Calls:none
*/
int delete_front()
{
int item;
if(Q.front==-1)
Q.front++;
item=Q.que[Q.front];
Q.que[Q.front]=-1;
Q.front++;
return item;

}
/* The insert_front function
Input:the item to be inserted by front
Output:returns the front
Called By:main
Calls:none
*/
int insert_front(int item)
{
int i,j;
if(Q.front==-1)
Q.front++;
i=Q.front-1;
while(i>=0)
{
Q.que[i+1]=Q.que[i];
i—;
}
j=Q.rear;
while(j>=Q.front)
{
Q.que[j+1]=Q.que[j];
j—;
}
Q.rear++;
Q.que[Q.front]=item;
return Q.front;
}
/* The delete_rear function
Input: none
Output: the item to deleted
Called By:main
Calls:none
*/
int delete_rear()
{
int item;
item=Q.que[Q.rear];
Q.que[Q.rear]=-1;/*logical deletion*/
Q.rear—;
return item;
}
/* The display function
Input:none
Output:none,it displays the contents in the queue
Called By:main
Calls:none
*/
void display()
{
int i;
printf(―n Straight Queue is:‖);
for(i=Q.front;i<=Q.rear;i++)

}
/* The main function
Input:none
Output:none
Called By:O.S.

Calls:Qfull,Qempty,insert_rear,Insert_front,delete_front,delete_rear,displ
ay
*/
void main()
{
int choice,i,item;
char ans;
ans=‘y‘;
Q.front=-1;
Q.rear=-1;
for(i=0;i<size;i++)
Q.que[i]=-1;
clrscr();
printf(―ntt Program For doubly ended queue using arrays‖);
do
{
printf(―n1.insert by rearn2.delete by frontn3.insert by
frontn4.delete by rear‖);
printf(―n5.displayn6.exit‖);
printf(―n Enter Your choice‖);
switch(choice)
{
case 1:if(Qfull())
printf(―n Doubly ended Queue is full‖);
else
{
printf(―n Enter The item to be inserted‖);
Q.rear=insert_rear(item);
}
break;
case 2:if(Qempty())
printf(―n Doubly ended Queue is Empty‖);
else
{
item=delete_front();
printf(―n The item deleted from queue is
%d‖,item);
}
break;
case 3:if(Qfull())
printf(―n Doubly ended Queue is full‖);
else
{
printf(―n Enter The item to be inserted‖);
Q.front=insert_front(item);

}
break;
case 4:if(Qempty())
printf(―n Doubly ended Queue is Empty‖);
else
{
item=delete_rear();
printf(―n The item deleted from queue is
%d‖,item);
}
break;
case 5:display();
break;
case 6:exit(0);
}
printf(―n Do You Want To Continue?‖);
ans=getch();
}while(ans==‘y‘||ans==‘Y‘);
getch();
}
5)‘C’ program
/************************************************************
Program for implementing the ascending priority Queue
************************************************************/
/*Header Files*/
#include<stdio.h>
#include<conio.h>
#include<process.h>
#define size 5

int rear,front;
int que[size];
/*
The Qfull function
Input:none
Output:1 or 0 for Qfull or not resp.
Called By:main
Calls:none
*/
Qfull()
{
if(rear ==size-1)
return 1;
else
return 0;
}

/* The insert function
Input:none
Output:none
Called By:main
Calls:priority
*/
void insert()

{ int item;
void priority();
printf(―nEnter the elementn‖);
if(front ==-1)
front++;
que[++rear]= item;
priority();
}
/*
The priority function
Input:none
Output:none
Called By:insert
Calls:none
*/
void priority()
{
int i,j,temp;
for(i=front;i<=rear-1;i++)
for(j=front;j<rear;j++)
if(que[j]>que[j+1])
{
temp = que[j];
que[j] = que[j+1];
que[j+1] =temp;
}
}
/*
The Qempty function
Input:none
Output:1 or 0
Called By:main
Calls:none
*/
Qempty()
{
if((front==-1)||(front>rear))
return 1;
else
return 0;
}
/*
The delet function
Input:none
Output:none
Called By:main
Calls:none
*/
void delet()
{
int item;
item=que[front];
printf(―n The item deleted is %d‖,item);

front++;
}
/*
The display function
Input:none
Output:none
Called By:main
Calls:none
*/
void display()
{ int i;
printf(―n The queue is:‖);
for(i=front;i<=rear;i++)
printf(― %d‖,que[i]);
}
/*
Name:main()
Input:none
Output:none
Calls:Qfull,Qempty,insert,delet,display
*/
void main(void)
{
int choice;
char ans;
clrscr();
front=rear=-1;
printf(―ntt Priority Queuen‖);
do
{
switch(choice)
{
case 1:if(Qfull())
printf(―n Queue IS full‖);
else
insert();
break;
case 2:if(Qempty())
printf(―n Cannot delete element‖);
else
delet();
break;
case 3:if(Qempty())
printf(―n Queue is empty‖);
else
display();
break;
default:printf(―n Wrong choice‖);
break;
}

printf(―n Do You Want TO continue?‖);
ans =getche();
}while(ans==‘Y‘ ||ans==‘y‘);
getch();
}
/***************** End Of the program********************/

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