public static void Main(string[] args)
{
ptBac2 a = new ptBac2(-1, 2, -3);
ptBac2 b = new ptBac2(4, -5, 6);
Console.Write("Phuong trinh 1 co dang: ");
a.xuat();
Console.Write("Phuong trinh 2 co dang: ");
b.xuat();
ptBac2 tong = a + b;
ptBac2 hieu = a - b;
a--;
b--;
Console.Write("Phuong trinh 1 dao nguoc co dang: ");
a.xuat();
Console.Write("Phuong trinh 2 dao nguoc co dang: ");
b.xuat();
Console.Write("Phuong trinh tong co dang: ");
tong.xuat();
Console.Write("Phuong trinh hieu co dang: ");
hieu.xuat();
Console.ReadKey();
}
public static ptBac2 operator -(ptBac2 pt1, ptBac2 pt2)
{
ptBac2 ptTong = new ptBac2();
ptTong.a = pt1.a - pt2.a;
ptTong.b = pt1.b - pt2.b;
ptTong.c = pt1.c - pt2.c;
return(ptTong);
}
public static ptBac2 operator--(ptBac2 pt)
{
ptBac2 pt2 = new ptBac2();
pt2.a = -1 * pt.a;
pt2.b = -1 * pt.b;
pt2.c = -1 * pt.c;
return(pt2);
}