Program:
#include <stdio.h>
#include <stdlib.h>
int front = -1;
int rear = -1;
int qu[5];
void enqueue()
{
if ((front == 0 && rear == 4) || front == rear + 1)
printf("Overflow: Queue is Full. You cannot add more items");
else
{
if (front == -1)
front = rear = 0;
else if (rear == 4)
rear = 0;
else
rear = rear + 1;
printf("\nenter value");
scanf("%d", &qu[rear]);
}
}
void dequeue()
{
if (front == -1)
printf("underflow!!!. Queue is empty. No item to delete");
else
{
printf("Deleted item is : %d", qu[front]);
if (front == rear)
front = rear = -1;
else if (front == 4)
front = 0;
else
front = front + 1;
}
}
void peek()
{
if (front == -1)
printf("Queue is empty. No item to display");
else
{
printf("Item at the Front is :%d", qu[front]);
}
}
void display()
{
if (front == -1)
printf("Queue is empty. No item to display");
else
{
printf("\nInformation of Queue is : \n");
if ( front<=rear)
for (int i = front; i <= rear; i++)
printf("\n%d", qu[i]);
else
{
for (int i = front; i <5; i++)
printf("\n%d", qu[i]);
for (int i = 0; i <=rear; i++)
printf("\n%d", qu[i]);
}
}
}
void main()
{
int ch;
printf("****************************************\n");
printf("****************************************\n");
printf("** Static Circular Queue Using Array **\n");
printf("** Program Created By Sheetal Garg **\n");
printf("** Assistant professor **\n");
printf("** 9467863365 **\n");
printf("****************************************\n");
printf("****************************************\n");
while (1)
{
printf("\nOptions Available are\n");
printf("1. Enqueue \n");
printf("2. Dequeue \n");
printf("3. Peek \n");
printf("4. Display \n");
printf("5. Exit \n");
printf("\nEnter your choice : ");
scanf("%d", &ch);
switch (ch)
{
case 1:
enqueue();
break;
case 2:
dequeue();
break;
case 3:
peek();
break;
case 4:
display();
break;
case 5:
exit(0);
default:
printf("Wrong choice entered");
}
}
}Output:
****************************************
****************************************
** Static Circular Queue Using Array **
** Program Created By Sheetal Garg **
** Assistant professor **
** 9467863365 **
****************************************
****************************************
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value10
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value20
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value30
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value40
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value50
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
Overflow: Queue is Full. You cannot add more items
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 10
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 20
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Information of Queue is :
30
40
50
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value100
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 1
enter value200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Information of Queue is :
30
40
50
100
200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 3
Item at the Front is :30
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 30
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Information of Queue is :
40
50
100
200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 40
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Information of Queue is :
50
100
200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 50
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Information of Queue is :
100
200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 100
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Information of Queue is :
200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
Deleted item is : 200
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 4
Queue is empty. No item to display
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 2
underflow!!!. Queue is empty. No item to delete
Options Available are
1. Enqueue
2. Dequeue
3. Peek
4. Display
5. Exit
Enter your choice : 5