Solution:-
#include<stdio.h>
#include<conio.h>
#include<process.h>
# define maxsize 5
int queue[maxsize];
int rear=-1;
int front=-1;
void enque();
void deque();
void display();
void main()
{
int choice;
clrscr();
do
{
printf("\n 1.ENQUEUW");
printf("\n 2.DEQUEUE");
printf("\n 3.DISPLAY");
printf("\n 4.EXIT");
printf("\n Enter your choice: \t");
scanf("%d",&choice);
switch(choice)
{
case 1: enque();
break;
case 2: deque();
break;
case 3: display();
break;
case 4: exit(0);
break;
}
}
while(choice!=4);
getch();
}
void enque()
{
int item;
if(rear==maxsize-1)
printf("\n QUEUE OVERFLOW");
else
{
printf("\n Enter item: \t");
scanf("%d",&item);
if(rear==-1)
{
rear=0;
front=0;
}
else
rear=rear+1;
queue[rear]=item;
printf("\n %d is inserted successfully",queue[rear]);
}
}
void deque()
{
int item;
if(front==-1)
printf("\n QUEUE UNDERFLOW");
else
{
item=queue[front];
if(rear==front)
{
front=-1;
rear=-1;
}
else
front=front+1;
printf("\n %d is deleted successfully",item);
}
}
void display()
{
int i;
if(rear==-1)
printf("\n NO ITEM");
else
{
for(i=front;i<=rear;i++)
printf("%d \t",queue[i]);
}
}
