assigment_back_up

#include<iostream>
#include<string>
#include<cstdlib>
#include<string>
#include<vector>
using namespace std;
// khai bao thong tin san pham.
struct product
{
	int serius;
	string name;
	string maufacturing_date;
	string expiry_date;
	int number;
	int price;
};

//Menu hien thi danh cho nhan vien ban hang
void display_2()
{
	cout << "===========================================" << endl;
	cout << " MENU " << endl;
	cout << "===========================================" << endl;
	cout << "1.Them san pham " << endl;
	cout << "2.Cap nhat thong tin san pham" << endl;
	cout << "3.Xoa thong tin san pham" << endl;
	cout << "4.Tim kiem thong tin san pham " << endl;
	cout << "5.Mua san pham " << endl;
}
//tim vi tri san pham.
int search(vector<product> &ordinal_number, int id, int biendem)
{
	int find = -1;
	for (int i = 0; i < biendem && find == -1; i++)
	{
		if (ordinal_number[i].serius == id) find = i;
		else find = -1;
	}
	return find;
}
// 1.Them san pham.
void add_product(vector<product>&ordinal_number, int& biendem)
{
again:
	cout << "Nhap so serius cua san pham ";
	cin >> ordinal_number[biendem].serius;
	cin.ignore(1);
	if (search(ordinal_number, ordinal_number[biendem].serius, biendem) != -1)
	{
		cout << endl << "Da ton tai san pham vua nhap " << endl;
		goto again;
	}
	cout << " Nhap ten hang hang hoa : ";
	getline(cin, ordinal_number[biendem].name);
	cout << "Ngay san xuat :";
	getline(cin, ordinal_number[biendem].maufacturing_date);
	cout << "Han su dung : ";
	getline(cin, ordinal_number[biendem].expiry_date);
	cout << "So luong : ";
	cin >> ordinal_number[biendem].number;
	cin.ignore(1);
	cout << "Gia ban thi truong : ";
	cin >> ordinal_number[biendem].price;
	cin.ignore(1);
	++biendem;
}
//2.Cap nhat thong tin san pham.
void change_product(vector<product>&ordinal_number, int biendem)
{
	int id;
	int index2;
	if (biendem > 0)
	{
		cout << "Nhap so serius cua san pham can cap nhat : " << endl;
		cin >> id;
		index2 = search(ordinal_number, id, biendem);
		if (index2 != -1)
		{
			cout << " Nhap ten hang hang hoa : ";
			getline(cin, ordinal_number[index2].name);
			cout << "Ngay san xuat :";
			getline(cin, ordinal_number[index2].maufacturing_date);
			cout << "Han su dung : ";
			getline(cin, ordinal_number[index2].expiry_date);
			cout << "So luong : ";
			cin >> ordinal_number[index2].number;
			cin.ignore(1);
			cout << "Gia ban thi truong : ";
			cin >> ordinal_number[index2].price;
			cin.ignore(1);
		}
		else cout << "Khong ton tai san pham tren" << endl;

	}
	else cout << "Khong co san pham de thuc hien " << endl;
}
//3.Xoa san pham.
void eraser(vector<product>&ordinal_number, int index3)
{
	ordinal_number[index3].serius = 0;
	ordinal_number[index3].name = "";
	ordinal_number[index3].maufacturing_date = "";
	ordinal_number[index3].expiry_date = "";
	ordinal_number[index3].number = 0;
	ordinal_number[index3].price = 0;
}
void delete_product(vector<product>&ordinal_number, int biendem)
{
	int id;
	int index3;
	if (biendem > 0)
	{
		cout << "Nhap so serius cua san pham : " << endl;
		cin >> id;
		index3 = search(ordinal_number, id, biendem);
		if (index3 != -1)
		{
			if (index3 == (biendem - 1))
			{
				eraser(ordinal_number, index3);
				--biendem;
				cout << "Bien dem da duoc xoa" << endl;
			}
			else
			{
				for (int i = index3; i < biendem - 1; i++)
				{
					ordinal_number[i] = ordinal_number[i + 1];
					eraser(ordinal_number, biendem);
					--biendem;
				}
			}
		}
		else cout << "San pham tren khong ton tai" << endl;
	}
	else cout << "Khong co san pham bi xoa" << endl;
}
//4.Tim kiem san pham;
void local_product(vector<product>&ordinal_number, int biendem)
{
	int id;
	int index4;
	if (biendem > 0)
	{
		cout << "Nhap so serius cua san pham can xem thong tin : " << endl;
		cin >> id;
		index4 = search(ordinal_number, id, biendem);
		if (index4 != -1)
		{
			cout << " Ten san pham la   " << ordinal_number[index4].name << endl;
			cout << "Ngay san xuat cua san pham " << ordinal_number[index4].maufacturing_date << endl;
			cout << " Ngay het han : " << ordinal_number[index4].expiry_date << endl;
			cout << "So luong con lai ="<< ordinal_number[index4].number<<endl ;
			cout << "Gia ban =" << ordinal_number[index4].price << endl;
		}
		else cout << "Khong ton tai san pham tren" << endl;

	}
	else cout << "Khong co san pham de thuc hien " << endl;
}
//5.Mua san pham.
void buy(vector<product>&ordinal_number, int biendem,int &sum_price_buy)
{
	int id;
	int index5, price_buy, number_product_buy, number_buy;
	if (biendem > 0)
	{
		cout << "ban muon mua bao nhieu mat hang";
		cin >> number_product_buy;
		for (int i = 0; i < number_product_buy; i++)
		{
			cout << "Nhap so serius cua san pham can mua lan thu " << i+1 << "="<< endl;
			cin >> id; cin.ignore(1);
			index5 = search(ordinal_number, id, biendem);
			if (index5 != -1)
			{
				cout << "Nhap so luong can mua =  " << endl;
				cin >> number_buy;
				if (ordinal_number[index5].number - number_buy >= 0)
				{
					price_buy = number_buy*ordinal_number[index5].price;
					cout << "so tien ban can phai tra = " << price_buy << endl;
					ordinal_number[index5].number = ordinal_number[index5].number - number_buy;
					sum_price_buy= sum_price_buy + price_buy;
				}
				else cout << "Khong du so luong mua " << endl;

			}
			else cout << "Khong ton tai san pham tren " << endl;
		}
		cout << "tong tien phai tra bang = "<< sum_price_buy<<endl;
	}

	else cout << "Khong co san pham de thuc hien " << endl;
}

int main()
{
	vector <product> ordinal_number(20);
	int biendem = 0;
	int sum_price_buy = 0;
	display_2();
	int choose;
	char confirm;
	do
	{
		cout << "Nhap su lua chon cua ban" << endl;
		cin >> choose;
		switch (choose)
		{
		case 1:add_product(ordinal_number, biendem); break;
		case 2:change_product(ordinal_number, biendem); break;
		case 3:delete_product(ordinal_number, biendem); break;
		case 4:local_product(ordinal_number, biendem); break;
		case 5:buy(ordinal_number, biendem, sum_price_buy); break;
		default:cout << "khong hop le"<<endl;
		}
		cout << "Nhan y hoac Y de tiep tuc: ";
		cin >> confirm;
	} while (confirm == 'y' || confirm == 'Y');
	return 0;
}