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Queue in C using Array
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Queue in C using Array
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#include <stdio.h>
#include <stdlib.h>
#define MAX 5
int q[MAX];
int front, rear;
front =-1;
rear=-1;
void enq();
void deq();
void display();
int main()
{
int i,p,r;
while(1)
{
printf("***QUEUE*** \n");
printf("1.Enqueue\n2.Dequeue\n3.Display\n4.Exit\n");
scanf("%d", &p);
switch(p)
{
case 1:
enq();
break;
case 2:
deq();
break;
case 3:
display();
break;
case 4:
exit(0);
}
}
return 0;
}
void enq()
{
int p;
printf("Enter value to be enqueued. \n");
scanf("%d", &p);
if(rear==MAX-1)
{
printf("Queue is full. \n");
return;
}
else
{
if (front==-1)
front=0;
rear++;
q[rear]=p;
}
}
void deq()
{
if (front==-1 || front>rear)
{
printf("Queue is empty. \n");
return;
}
else
{
printf("The dequeued value is %d \n", q[front]);
front++;
if(front>rear)
{
front=rear=-1;
return;
}
}
}
void display()
{
int i,p;
if(front==-1 || front>rear)
{
printf("Queue is empty. \n");
return;
}
for(i=front;i<=rear;i++)
{
printf("%d \n", q[i]);
}
}