Inventory Class Design an Inventory class that can hold information and calculat

Question

Inventory Class
Design an Inventory class that can hold information and calculate data for item in a
retail store’s inventory. The class should have the following private member variables:
Variable Name & Description
itemNumber an int that holds the item’s item number.
quantity an int for holding the quantity of the items on-hand.
cost a double for holding the wholesale per-unit cost of the ii
totalCost a double for holding the total inventory cost of the item
(calculated as quantity times cost).

The class should have the following public member functions:
Default : sets all the member variables to 0.
Constructor
Constructor #2: accepts an item’s number, cost, and quantity as argument the function should copy these values to the appropriate member
variables and then call the setTotalCost function.
setltemNumber : accepts an integer argument that is copied to the itemNumber
member variable.
setQuantity : accepts an integer argument that is copied to the quantity member variable.
setCost: accepts a double argument that is copied to the cost member variable.
setTotalCost : calculates the total inventory cost for the item (quantity times cost) and stores the result in totalcost.
getltemNumber : returns the value in itemNumber.
getQuantity: returns the value in quantity.
getCost : returns the value in cost.
getTotalcost : returns the value in totalcost.




Demonstrate the class in a driver program.
Input Validation: Do not accept negative values for item number, quantity, or cost.

Explanation / Answer

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#include <iostream>
#include <iomanip>
using namespace std;
class Inventory
{
private:
   int itemNumber;
   int quantity;
   double cost;
   double totalCost;
public:
   Inventory()
      {itemNumber=0;
      quantity=0;
      cost=0;
      totalCost=0;
      }
      Inventory(int i,int q,double c)
      {itemNumber=i;
       quantity=q;
       cost=c;
       setTotalCost();
       }
   void setItemNumber(int i)
        {if(i>=0)
            itemNumber=i;
        else
            {cout<<"invalid entry ";
             system("pause");
             exit(1);
             }
        }
   void setQuantity(int q)
        {if(q>=0)
            quantity = q;
        else
           {cout<<"invalid entry ";
           system("pause");
           exit(1);
           }
        }
   void setCost(double c)
        {
        if(c>=0)
           cost=c;
        else
           {cout<<"invalid entry ";
           system("pause");
           exit(1);
           }
        }
   void setTotalCost()
      {totalCost=quantity*cost;
      }
   int getItemNumber()
      {return itemNumber;
       }
   int getQuantity()
      {return quantity;
      }
   double getCost()
      {return cost;
      }
   double getTotalCost()
      {return totalCost;
      }
};
int main()
{Inventory a;
cout<<"A ";
cout<<"Item number: "<<a.getItemNumber()<<endl;
cout<<"Quantity: "<<a.getQuantity()<<endl;
cout<<"Cost: $"<<setprecision(2)<<fixed<<a.getCost()<<endl;
cout<<"Total cost: $"<<setprecision(2)<<fixed<<a.getTotalCost()<<endl;
cout<<"B ";
Inventory b(50,5,2.4);
cout<<"Item number: "<<b.getItemNumber()<<endl;
cout<<"Quantity: "<<b.getQuantity()<<endl;
cout<<"Cost: $"<<setprecision(2)<<fixed<<b.getCost()<<endl;
cout<<"Total cost: $"<<setprecision(2)<<fixed<<b.getTotalCost()<<endl;
cout<<"CHANGING B ";
b.setItemNumber(11);
cout<<"New item number: "<<b.getItemNumber()<<endl;
b.setQuantity(1);
cout<<"New quantity: "<<b.getQuantity()<<endl;
b.setCost(4);
cout<<"New cost: $"<<setprecision(2)<<fixed<<b.getCost()<<endl;
b.setTotalCost();
cout<<"New total cost: $"<<setprecision(2)<<fixed<< b.getTotalCost()<<endl;
cout<<"Testing 1 error ";
a.setQuantity(-2);
return 0;
}

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