Code

*/
#include <stdio.h>
#include <stdlib.h>
#include "queueHeader.h"

int  main() {
        QUEUE *pointerToQ;
        queueManage(&pointerToQ, 1, 10);
        int i = 0;
        for(i = 0; i < 10; i++){
                addToQueue(pointerToQ, i);
        }
        printf("Pointer is pointing to %d", pointerToQ -> count);

        int *val = 0;
        removeFromQueue(pointerToQ, val);
        printf("The value of val is %d", val);

}


/*
 * line Manager
*/
#include <stdio.h>
#include <stdlib.h>
#include "queueHeader.h"

/*
 * create or delete a queue
 *
 * PARAMETERS:	QUEUE **qptr	space for, or pointer to, queue
 * 		int flag	1 for create, 0 for delete
 *		int size	max elements in queue
 */
void queueManage(QUEUE **qptr, int flag, int size)
{
	if (flag){
		/* allocate a new queue */
		*qptr = malloc(sizeof(QUEUE));
		(*qptr)->head = (*qptr)->count = 0;
		(*qptr)->que = malloc(size * sizeof(int));
		(*qptr)->size = size;
	}
	else{
		/* delete the current queue */
		(void) free((*qptr)->que);
		(void) free(*qptr);
	}
}

/*
 * add an element to an existing queue
 *
 * PARAMETERS:	QUEUE *qptr	pointer for queue involved
 *		int n		element to be appended
 */
void addToQueue(QUEUE *qptr, int n)
{
	/* add new element to tail of queue */
	qptr->que[(qptr->head + qptr->count) % qptr->size] = n;
	qptr->count++;

}

/*
 * take an element off the front of an existing queue
 *
 * PARAMETERS:	QUEUE *qptr	pointer for queue involved
 *		int *n		storage for the return element
 */
void removeFromQueue(QUEUE *qptr, int *n)
{
	/* return the element at the head of the queue */
	*n = qptr->que[qptr->head++];
	qptr->count--;
	qptr->head %= qptr->size;
}

/*
 * line Manager Header file
 */


/*
 * the queue structure
 */
typedef struct queue {
	int *que;		/* the actual array of queue elements */
	int head;		/* head index in que of the queue */
	int count;		/* number of elements in queue */
	int size;		/* max number of elements in queue */
} QUEUE;

/*
 * the library functions
 */
void queueManage(QUEUE **, int, int);	/* create or delete a queue */
void addToQueue(QUEUE *, int);	/* add to queue */
void removeFromQueue(QUEUE *, int *);	/* remove from queue */