[OPP-C++] Danh sách hàng

#include <iostream>
#include <cstring>
using namespace std;

class Hang {
	private:
		int maHang;
		int loaiHang;
		char xuatSu[50];
		long gia;
	public:
		Hang() {
			maHang = 0;
			loaiHang = 0;
			strcpy(xuatSu, "");
			gia = 0;
		}
		Hang(int mh, int lh, char xs[], long g) {
			maHang = mh;
			loaiHang = lh;
			strcpy(xuatSu, xs);
			gia = g;
		}
		void nhap();
		void xuat();
		int layLoaiHang() {
			return loaiHang;
		}
};

void Hang::nhap() {
	cout << "Ma hang: "; cin >> maHang;
	cout << "Loai hang: "; cin >> loaiHang;
	cout << "Xuat su: "; cin.ignore(1); cin.get(xuatSu, 50);
	cout << "Gia: "; cin >> gia;
}

void Hang::xuat() {
	cout << "Ma hang: " << maHang << endl;
	cout << "Loai hang: " << loaiHang << endl;
	cout << "Xuat su: " << xuatSu << endl;
	cout << "Gia: " << gia << endl << endl;
}

int main() {
	Hang *ds;
	int n;
	cout << "Nhap so mat hang: "; cin >> n;
	ds = new Hang[n + 1];
	for (int i = 1; i <= n; i++) {
		cout << endl << "Nhap mat hang thu " << i << endl;
		ds[i].nhap();
	}
	cout << endl << "Danh sach cac mat hang vua nhap" << endl << endl;
	for (int i = 1; i <= n; i++) {
		ds[i].xuat();
	}
	
	//dem so luong
	int dem1, dem2, dem3, dem4;
	dem1 = dem2 = dem3 = dem4 = 0;
	for (int i = 1; i <= n; i++) {
		if (ds[i].layLoaiHang() == 1) dem1++;
		else if (ds[i].layLoaiHang() == 2) dem2++;
		else if (ds[i].layLoaiHang() == 3) dem3++;
		else dem4++;
	}
	cout << endl << "So mat hang cua moi loai:" << endl << endl;
	cout << "Loai 1: " << dem1 << endl;
	cout << "Loai 2: " << dem2 << endl;
	cout << "Loai 3: " << dem3 << endl;
	cout << "Loai 4: " << dem4 << endl;
}