Function Purchase

Lab_21/e-commerce.cpp:175–372

};

void Purchase(){
	PackedGroceries p; // declaration of object PackedGroceries
	FreshGroceries f; // declaration of object for class FreshGroceri

	for (int i = 0; i < 1000; i++) {
		system("cls");

		string UIC; // UIC for serching the product from the file

		ofstream outBill("Bill", ios::binary | ios::app);

		cout << "Second Main Menu: \n";
		cout << "1. Go to Packed Groceries\n";
		cout << "2. Go to Fresh Groceries \n";
		cout << "3. Bill \n";
		cout << "0. Go Back\n";
		cout << "Your choice: \n";

		switch (_getch()) {
		case '1': {
			system("cls");
			ofstream outTempPacked("TempPacked", ios::binary | ios::app);

			// listing the products which exist
			ifstream inPacked1("Packed", ios::binary);
			cout << left << setw(20) << "Name" << setw(15) << "UIC" << setw(20) << "Price" << setw(15) << "Quantity" << endl;
			while (inPacked1.read((char*)&p, sizeof(PackedGroceries))) {
				p.display();
			}
			inPacked1.close();			// closing the files after execution

			// searching the product by its code
			cout << "\nEnter the UIC of product you want to purchase: ";
			cin >> UIC;

			bool isFound = false; // bool for cheaking the existance of product

			ifstream inPacked("Packed", ios::binary);
			while (inPacked.read((char*)&p, sizeof(PackedGroceries))) {	
				// serching from the file the product
				if (p.get_UIC() == UIC) {
					isFound = true;	
					if (p.get_quantity() > 0) { // validation for quantity
						p.get_quantity_p(); // functions for calculating the quantities
					}
					else if (p.get_quantity() < 0) { // quantity cannot be less than zero
						cout << "Sorry, product is over!\n";
					}
					// w
					outTempPacked.write((char*)&p, sizeof(PackedGroceries));
					outBill.write((char*)&p, sizeof(PackedGroceries));

					cout << "Successfully purchased 1 pc.\n";
					cout << "Done Great\n";
				}		
				else if (p.get_UIC() != UIC) {
					outTempPacked.write((char*)&p, sizeof(PackedGroceries));