void nhapsach(Sach &s)
{
getchar();
cout << "Nhap ma sach: ";
getline(cin, s.m);
cout << "Nhap ten sach: ";
getline(cin, s.ten);
cout << "Nhap ten tac gia: ";
getline(cin, s.tg);
cout << "Nhap nha xuat ban:";
getline(cin, s.nhxb);
cout << "Nhap gia ban: ";
cin >> s.gia;
cout << "Nhap so trang: ";
cin >> s.st;
cout << "Nhap nam xuat ban: ";
cin >> s.namxb;
}
void xuatsach(Sach s)
{
cout << endl << "Ma sach: " << s.m;
cout << endl << "Ten sach: " << s.ten;
cout << endl << "Ten tac gia: " << s.tg;
cout << endl << "Nha xuat ban: " << s.nhxb;
cout << endl << "Gia ban: " << s.gia;
cout << endl << "So trang: " << s.st;
cout << endl << "Nam xuat ban: " << s.namxb;
}