#include <iostream>
#include <string>
#include <fstream>
using namespace std;

const int DES = 20;

//declare variables
void Add();
void Display();
void Edit();
void Exit();

struct Inventory
{
	char item[DES];
	int qty;
	int wcost;
	int rcost;
	char date[10];
};

//Main function
int main()
{
	int choice;
	do
	{
		cout << "1. Add a new record: " << endl;
		cout << "2. Display a previous record: " << endl;
		cout << "3. Edit an old record:" << endl;
		cout << "4. Exit the program:" << endl;

		cin >> choice;

		switch (choice)
		{
		case 1:
			Add();
			break;
		case 2:
			Display();
			break;
		case 3:
			Edit();
			break;
		case 4:
			Exit();
			break;


		default: cout << "Invalid Selection" << endl;
		}
	} while
		(choice <= 2);

	system("PAUSE");
	return 0;
}


//Add funtion
void Add()
{
	fstream fout;
	const int size = 3;
	char ch;
	int i = 0;
	fout.open("Records.txt", ios::out | ios::ate);
	Inventory inv;

	//get data
	do
	{
		cout << "Enter item description: " << endl;
		cin.ignore();
		cin.getline(inv.item, DES);
		cout << "Enter quantity: " << endl;
		cin >> inv.qty;
		cout << "Enter wholesale cost: " << endl;
		cin >> inv.wcost;
		cout << "Enter retail cost: " << endl;
		cin >> inv.rcost;
		cout << "Enter date: " << endl;
		cin.ignore();
		cin.getline(inv.date, 10);

		//write record to file
		fout.write(reinterpret_cast<char*>(&inv), sizeof(inv));
		cout << "Do you want to add another record? " << endl;
		cin >> ch;
	} while
		(ch == 'Y' && 1 < 3);

	//close the file
	fout.close();
}

//"Display" function
void Display()
{
	fstream fout;
	fout.open("Records.txt", ios::in);
	Inventory inv;
	fout.read(reinterpret_cast <char*> (&inv), sizeof(inv));
	while (!fout.eof())

	{

		cout << "\nDescription\t: ";
		cout << inv.item;
		cout << "\nQuantity\t: ";
		cout << inv.qty;
		cout << "\nWholesale Cost\t: ";
		cout << inv.wcost;
		cout << "\nRetail Cost\t: ";
		cout << inv.rcost;
		cout << "\nDate\t: ";
		cout << inv.date;
		fout.read(reinterpret_cast <char*> (&inv), sizeof(inv));
	}
	//close the file
	fout.close();
	void edit
	{
	fstream fout;
	fout.open("Records.txt", ios::in);
	Inventory inv;
	fout.open("Records.txt", ios::out | ios::ate);
	Inventory inv;

	//get data
	do
	{
		cout << "Enter item description: " << endl;
		cin.ignore();
		cin.getline(inv.item, DES);
		cout << "Enter quantity: " << endl;
		cin >> inv.qty;
		cout << "Enter wholesale cost: " << endl;
		cin >> inv.wcost;
		cout << "Enter retail cost: " << endl;
		cin >> inv.rcost;
		cout << "Enter date: " << endl;
		cin.ignore();
		cin.getline(inv.date, 10);

		//write record to file
		fout.write(reinterpret_cast<char*>(&inv), sizeof(inv));
		cout << "Do you want to add another record? " << endl;
		cin >> ch;
	} while
		(ch == 'Y' && 1 < 3);

	//close the file
	fout.close();
	}