2016-08-21

Lab Program 6:

Design, Develop and Implement a menu driven Program in C for the following operations on Circular QUEUE of Characters (Array Implementation of Queue with maximum size MAX)
a. Insert an Element on to Circular QUEUE
b. Delete an Element from Circular QUEUE
c. Demonstrate Overflow and Underflow situations on Circular QUEUE
d. Display the status of Circular QUEUE
e. Exit
Support the program with appropriate functions for each of the above operations

#include <stdio.h>
#include<stdlib.h>
#include<stdio_ext.h>
#define MAX 3

char cq[MAX];
int front = -1, rear = -1;

void insert(char);
void delete();
void display();

void main()
{
int ch;
char item;
while(1)
{
printf("\n\n~~Main Menu~~");
printf("\n==> 1. Insertion and Overflow Demo");
printf("\n==> 2. Deletion and Underflow Demo");
printf("\n==> 3. Display");
printf("\n==> 4. Exit");
printf("\nEnter Your Choice: ");
scanf("%d", &ch);
__fpurge(stdin);
switch(ch)
{
case 1: printf("\n\nEnter the element to be inserted: ");
scanf("%c", &item);
insert(item);
break;
case 2: delete();
break;
case 3: display();
break;
case 4: exit(0);
default: printf("\n\nPlease enter a valid choice");
}
}
}

void insert(char item)
{
if(front == (rear+1)%MAX)
{
printf("\n\n~~Circular Queue Overflow~~");
}
else
{
if(front == -1)
front = rear = 0;
else
rear = (rear+1)%MAX;
cq[rear] = item;
}
}

void delete()
{
char item;
if(front == -1)
{
printf("\n\n~~Circular Queue Underflow~~");
}
else
{
item = cq[front];
printf("\n\nDeleted element from the queue is: %c ",item );

if(front == rear) //only one element
front = rear = -1;
else
front = (front+1)%MAX;
}
}

void display ()
{
int i ;
if(front == -1)
{
printf("\n\nCircular Queue Empty");
}
else
{
printf("\nCircular Queue contents are:\n");
printf("Front[%d]-> ", front);
for(i = front; i != rear ; i = (i+1)%MAX)
{
printf(" %c", cq[i]);
}
printf(" %c", cq[i]);
printf(" <-[%d]Rear", rear);
}
}

Output:
~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 1

Enter the element to be inserted: A

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 1
Enter the element to be inserted: B

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 1
Enter the element to be inserted: C

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 1

Enter the element to be inserted: D
~~Circular Queue Overflow~~

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 3

Circular Queue contents are:
Front[0]-> A B C <-[2]Rear

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 2

Deleted element from the queue is: A

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 3

Circular Queue contents are:
Front[1]-> B C <-[2]Rear

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 1

Enter the element to be inserted: E

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 3

Circular Queue contents are:
Front[1]-> B C E <-[0]Rear

~~Main Menu~~
==> 1. Insertion and Overflow Demo
==> 2. Deletion and Underflow Demo
==> 3. Display
==> 4. Exit
Enter Your Choice: 4

Also Credits to:
Manoj Taleka (manoj89biet@gmail.com)
Yashaswini Jogi (jogi.yash@gmail.com)

There is No Full Stop for Learning !!

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Module 1:

Module 2:

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Lab Program 6: