// Program to create a file (stock) and maintain it.
// Assignment-33
// stckfil.cpp, Author - Krishna Kumar Khatri.

// Uncomment ONLY the following line if you are using Turbo/Borland compiler.
// #define TC
#ifdef TC
	#include <iostream.h>
	#include <fstream.h>
#else
	#include <iostream>
	#include <fstream>
	using namespace std;
#endif
#include <conio.h>  // For getch.
const int MAXLEN = 25;

class Inventory
{
        int icode;
        char iname[MAXLEN];
        float icost;
    public:
        void getdata();
        void putdata();
};

void Inventory::getdata()
{
    cout << "Enter item code: "; cin >> icode;
    cout << "Enter item name: "; cin >> iname;
    cout << "Also enter cost: "; cin >> icost;
}

void Inventory::putdata()
{
    cout << "Item code: "; cout << icode << endl;
    cout << "Item name: "; cout << iname << endl;
    cout << "Item cost: "; cout << icost << endl;
}

int main()
{
    #ifdef TC
        clrscr();
    #endif
    Inventory invt[MAXLEN / 5];
    fstream fn;
    int n, i;
    
    do {
        cout << "How many items (1-" << MAXLEN / 5 << "): ";
        cin >> n;
    } while (n < 1 || n > MAXLEN / 5);
    
    fn.open("stock.txt", ios::out |
                         ios::in |
                         ios::trunc);

    for (i = 0; i < n; i++) {
        cout << endl << "Enter details for item # " << (i + 1) 
             << endl;
        invt[i].getdata();
        fn.write((char*)&invt[i], sizeof(Inventory));
        cout << "Data written to file." << endl;
    }
    
    fn.seekg(0);    // Reset the pointer to the BOF (reinitialize).
    
    cout << endl << endl 
         << "Reading back from the file." << endl << endl;
    for (i = 0; i < n; i++) {
        cout << endl << "Item details for item # " << (i + 1) << endl;
        fn.read((char*)&invt[i], sizeof(Inventory));
        invt[i].putdata();
    }    

    cout << endl << endl << "Program over. Press any key to exit...";
    getch();
    return 0; // Successful termination.
}