Issue With My School Assignment on Classes - c++

Question

So I have an assignment due in my C++ class on classes, and I'm having some trouble. Here is the description of the assignment:
Programming Challenge 7 on page 499 of your text asks you to design and Inventory Class that can hold information for an item in a retail store's inventory. You are given the code for the creation of the class along with code for the implementation of the functions. Demonstrate the class by writing a simple program that uses it. This program should demonstrate that each function works correctly. Submit your .cpp file using the link provided.
And here are the contents of the file sent (it's quite lengthy):
// Chapter 7---Files for Programming Challenge 13---Inventory Class
// This is the inventory.h file.
// It contains the Inventory class declaration.
#ifndef INVENTORY_H
#define INVENTORY_H
class Inventory
{
private:
int itemNumber;
int quantity;
double cost;
double totalCost;
public:
// Default constructor
Inventory()
{ itemNumber = quantity = cost = totalCost = 0; }
// Overloaded constructor
Inventory(int, int, double); // Defined in Inventory.cpp
// Mutators (i.e., "set" functions) defined in Inventory.cpp
void setItemNumber(int);
void setQuantity(int);
void setCost(double);
// setTotalCost calculates the total cost
// and stores the result in the totalCost member
void setTotalCost()
{ totalCost = cost * quantity; }
// Accessors (i.e., "get" functions)
int getItemNumber()
{ return itemNumber; }
int getQuantity()
{ return quantity; }
double getCost()
{ return cost; }
double getTotalCost()
{ return totalCost; }
// Input validation functions
bool validInt(int);
bool validFloat(double);
};
#endif
// This is the inventory.cpp file.
// It contains the Inventory class function definitions.
#include <iostream>
#include "Inventory.h"
using namespace std;
//************************************************************
// Overloaded constructor
// Accepts arguments to be stored in each member variable.
//************************************************************
Inventory::Inventory(int in, int q, double c)
{
setItemNumber(in);
setQuantity(q);
setCost(c);
setTotalCost();
}
//************************************************************
// setItemNumber accepts an argument to be stored in item number.
//************************************************************
void Inventory::setItemNumber(int in)
{
while (!validInt(in))
{
cout << "Item Number must be positive. Please re-enter: ";
cin >> in;
}
itemNumber = in;
}
//************************************************************
// setQuantity accepts an argument to be stored in quantity.
//************************************************************
void Inventory::setQuantity(int q)
{
while (!validInt(q))
{
cout << "Quantity must be positive. Please re-enter: ";
cin >> q;
}
quantity = q;
}
//************************************************************
// setCost accepts an argument to be stored in cost.
//************************************************************
void Inventory::setCost(double c)
{
while (!validInt(c))
{
cout << "Cost must be positive. Please re-enter: ";
cin >> c;
}
cost = c;
}
//************************************************************
// The validInt member tests its integer argument to see
// if it is negative. If the argument is negative, the function
// returns false. Otherwise, the function returns true.
//************************************************************
bool Inventory::validInt(int value)
{
if (value < 0) // the value is negative so it is NOT valid
return false;
else // the integer value is valid
return true;
}
//************************************************************
// The validFloat member tests its floating-point argument to see
// if it is negative. If the argument is negative, the function
// returns false. Otherwise, the function returns true.
//************************************************************
bool Inventory::validFloat(double value)
{
if (value < 0) // the value is negative so it is NOT valid
return false;
else // the floating-point value is valid
return true;
}
I'm just not sure how to use this information to make a program that demonstrates the class, and it could be as simple as me not saving the file the correct way

Answer 1

Just write a main function which instantiates an Inventory object and calls each of its methods in a meaningful way. This isn't a puzzle, just find a way to call the functions that makes sense to you.