Description:

In this tutorial you will see how to implement queue using array and queue insert & delete operations.

Code:

#include <stdio.h>
#define MAX 5
#include <stdlib.h>

void insert(int queue[], int *rear, int value)
{
 if(*rear < MAX-1)
  {
  *rear= *rear +1;
  queue[*rear] = value;
  }
	 else
	 {
	  printf("The queue is full \n");
	  exit(1);
	 }
}

void deleteQ(int queue[], int *front, int rear, int *value)
{
	if(*front == rear)
	{
	printf("The queue is empty \n");
	exit(1);
	}
        *front = *front + 1;
	*value = queue[*front];
}

void main()
{
  int queue[MAX];
  int front,rear;
  int n,value;
  front=rear=(-1);
  do
	{
        do
	  {
         printf("Enter the element to be inserted in queue\n");
	 scanf("%d",&value);
	 insert(queue,&rear,value);
	 printf("Enter 1 to continue\n");
	 scanf("%d",&n);
	 } while(n == 1);
  printf("Enter 1 to delete an element from queue\n");
  scanf("%d",&n);
  	while( n == 1)
 	{
 deleteQ(queue,&front,rear,&value);
 printf("The value deleted is %d\n",value);
 printf("Enter 1 to delete an element from queue\n");
 scanf("%d",&n);
 }
  printf("Enter 1 to continue\n");
  scanf("%d",&n);
	} while(n == 1);
}

Output:

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