Question

Modify your inventory management system created in previous assignment (assignments 2) to use dynamic memory allocation (instead of the fixed size array) and files to store the inventory information, so that there is no limitation on how much items your application could support and user doesn’t need to input the data over and over again.

assignment2
Your application shall maintain the following information regarding an item.

Item ID – unsigned long
Item name – string
Item cost – float
Quantity - int

Following are the list of administrative functionalities your application shall support:
1. Add new item to the inventory. This function will be used to add a single new item into the inventory management system.
2. Print all item information in the store - This function will be used to display all items in the inventory. When this option is selected system shall print Item ID, Item name, Item cost and quantity.
3. Find item by ID – This function will be used to search item using an ID. If item exist print item information. If not display an error indicating item not found.
4. Find item by name – This function will be used to search item using name. If item exist print item information. If not display an error indicating item not found.
5. Sort item by Name – This function will be used to sort all the items in the store by name.

Write a menu driven application in C++. Here is a sample menu.


Inventory Management System Menu
1. Add new item
2. Print item list
3. Find item by ID
4. Find item by name
5. Sort by name
6. Quit
Select: _


Note:
 Menu should be repeatedly prompted to the user until the Quit option is selected.
 Use the class construct to define an item. Keep the item properties as private member of the class and expose public accessor methods.
 Submit the source file (.cpp).

Answer 1

//C++ program

#include<iostream>
using namespace std;

class Item{
   private:
   unsigned long Item_ID ;
string ItemName;
float ItemCost;
int Quantity ;
public:
   Item(){}
       Item(unsigned long id , string name,float cost,int quant){
           Item_ID = id;
           ItemName = name;
           ItemCost = cost;
           Quantity = quant;
       }
       void setID(unsigned long id){
           Item_ID = id;
          
       }
       void setName(string name){
           ItemName = name;
       }
       void setCost(float cost){
           ItemCost = cost;
       }
       void setQuantity(int quant){
           Quantity = quant;
       }
       unsigned long getID(){
           return Item_ID ;
          
       }
       string getName(){
           return ItemName ;
       }
       float getCost(){
           return ItemCost;
       }
       int getQuantity(){
           return Quantity ;
       }

};

class inventory{
   private:
   Item *arr;
   int capacity;
   int noOfItem;
   public:
       inventory(int size){
           arr = new Item[size];
           capacity = size;
           noOfItem=0;
       }
       void addItem(Item item){
           if(noOfItem==capacity){
               cout<<"Inventory Full\n";
               return;
           }
           arr[noOfItem++] = item;
       }
       void print(){
           for(int i=0;i<noOfItem;i++){
               cout<<"Item"<<i+1<<"\n";
               cout<<arr[i].getID()<<"\n";
               cout<<arr[i].getName()<<"\n";
               cout<<arr[i].getCost()<<"\n";
               cout<<arr[i].getQuantity()<<"\n\n";
           }
       }
       void findById(unsigned long id){
           int i;
           for(i=0;i<noOfItem;i++)
               if(arr[i].getID()==id)break;
           if(i==noOfItem){
               cout<<"item not found.\n";
               return;
           }
              
               cout<<arr[i].getID()<<"\n";
               cout<<arr[i].getName()<<"\n";
               cout<<arr[i].getCost()<<"\n";
               cout<<arr[i].getQuantity()<<"\n\n";
       }
      
       void findByName(string name){
           int i;
           for(i=0;i<noOfItem;i++)
               if(arr[i].getName()==name)break;
           if(i==noOfItem){
               cout<<"item not found.\n";
               return;
           }
              
               cout<<arr[i].getID()<<"\n";
               cout<<arr[i].getName()<<"\n";
               cout<<arr[i].getCost()<<"\n";
               cout<<arr[i].getQuantity()<<"\n\n";
       }
      
       void sortByName(){
       for(int i=noOfItem-1;i>=0;i--){
       for(int j=0;j<i;j++){
           if(arr[j].getName()>arr[j+1].getName()){
               Item temp=arr[j];
               arr[j]=arr[j+1];
               arr[j+1]=temp;
           }
       }
   }
}
};
  
int main(){
   int choice;
   unsigned long id ;
string name;
float cost;
int quant ;
inventory in(20);
do{
   cout<<"1. Add new item\n2. Print item list\n3. Find item by ID\n4. Find item by name\n5. Sort by name\n6. Quit\nSelect:";
   cin>>choice;
   switch(choice){
       case 1:{
           cout<<"Enter Id : ";
           cin>>id;
           cout<<"Enter name : ";
           cin.get();
           getline(cin,name);
           cout<<"Enter cost : ";
           cin>>cost;
           cout<<"Enter Quantity : ";
           cin>>quant;
           in.addItem(*(new Item(id,name,cost,quant)));
               break;
           }
           case 2:{
               in.print();
               break;
           }
           case 3:{
               cout<<"Enter Id : ";
           cin>>id;
           in.findById(id);
               break;
           }
           case 4:{
               cout<<"Enter name : ";
           cin.get();
           getline(cin,name);
           in.findByName(name);
               break;
           }
           case 5:{
               in.sortByName();
               break;
           }
           default:{
               cout<<"Invalid input\n";
               break;
           }
       }
   }while(choice!=6);
   return 0;
}