#include <iostream>
#include <iomanip>
using namespace std;

class inventory
{
private:
	int item_number,
		quantity;
	double cost,
		   total_cost;
public:
	void set_item_number(int);
    void set_quantity(int);
	void set_cost(double);
	void set_total_cost(double);
	int get_item_number();
	int get_quantity();
	double get_cost();
	double get_total_cost();
};

void inventory::set_item_number(int i)
{
	item_number = i;
}

void inventory::set_quantity(int q)
{
	quantity = q;
}

void inventory::set_cost(double c)
{
	cost = c;
}

void inventory::set_total_cost(double tc)
{
	total_cost = tc;
}

int inventory::get_item_number()
{
	return item_number;
}

int inventory::get_quantity()
{
	return quantity;
}

double inventory::get_cost()
{
	return cost;
}

double inventory::get_total_cost()
{
	return quantity * cost;
}

int main()
{
	inventory info;
	int itemNumber = 0,
		quantity   = 0;
	double cost    = 0;

	cout << "Enter the item number of the item: ";
	do{cin >> itemNumber;
		if(itemNumber < 0)
		{
			cout << "Item cannot be a negative value!" << endl;
			cout << "Item Number: ";
		}
		else
			info.set_item_number(itemNumber);
	}while(itemNumber < 0);

	cout << "Enter the quantity of the items on-hand: ";
	do{cin >> quantity;
		if(quantity < 0)
		{
			cout << "Quantity cannot be a negative value!" << endl;
			cout << "Quantity: ";
		}
		else
			info.set_quantity(quantity);
	}while(quantity < 0);

	cout << "Enter the wholesale per-unit cost of the item: ";
	do{cin >> cost;
		if(cost < 0)
		{
			cout << "Cost of item cannot be a negative value!" << endl << endl;
			cout << "Cost: ";
		}
		else
			info.set_cost(cost);
	}while(cost < 0);

	cout << endl;
	cout << "The entered information: " << endl << endl;
	cout << "Item number:             " << info.get_item_number() << endl;
	cout << "Quantity:                " << info.get_quantity() << endl;
	cout << "Cost:                   $" << info.get_cost() << endl << endl;
	cout << "The total cost is:      $" << fixed << setprecision(2) << info.get_total_cost() << endl << endl;

	return 0;
}