/*	queue.h

	Header file for queue implementation
*/

/* Copyright 2003-2020 by Steven S. Skiena; all rights reserved.
Permission is granted for use in non-commerical applications
provided this copyright notice remains intact and unchanged.

These programs appear in my books:

"The Algorithm Design Manual" by Steven Skiena, second edition, Springer,
London 2008.  See out website www.algorist.com for additional information
or https://www.amazon.com/exec/obidos/ASIN/1848000693/thealgorith01-20

"Programming Challenges: The Programming Contest Training Manual"
by Steven Skiena and Miguel Revilla, Springer-Verlag, New York 2003.
See our website www.programming-challenges.com for additional information,
or https://www.amazon.com/exec/obidos/ASIN/0387001638/thealgorithmrepo/
*/



#include "item.h"

#define QUEUESIZE 1000

typedef struct {
    item_type q[QUEUESIZE+1];           /* body of queue */
    int first;                          /* position of first element */
    int last;                           /* position of last element */
    int count;                          /* number of queue elements */
} queue;

void init_queue(queue *q);
void enqueue(queue *q, item_type x);
item_type dequeue(queue *q);
item_type headq(queue *q);
int empty_queue(queue *q);
void print_queue(queue *q);