//Prototype of functions i created to manage queues

void queue_sort_model(queue <Inventory>); 	//sorts a queue alphabetically by 
											//model name and prints it to the //screen
void queue_sort_price(queue <Inventory>);	//sorts a queue in increasing order
											//price and prints it to the screen

void queue_remove_node(queue<Inventory>&, Inventory&); 	//removes a node from the 
														//queue

void queue_update(queue<Inventory>&, Inventory&);	//updates a node in the queue

void queue_print(const queue<Inventory>&); //prints a queue to the screen

void queue_print(const queue<Inventory>&, char*);	//prints a queue to a file

void queue_clear(queue<Inventory>&);	//empties a queue

void queue_copy(queue<Inventory>&, queue<Inventory>); 	//copies a queue into 		
														//another queue.  this is //not needed, you can use //the assignment //operator.

//be careful with the order in which you define this functions within the file 
//queue.cpp, place the functions that you call within other functions first