static void Main(string[] args)
{
Console.WriteLine("Giai phuong trinh bac 2: \n");
int a, b, c;
Console.Write("Nhap a: ");
a = int.Parse(Console.ReadLine());
Console.Write("Nhap b: ");
b = int.Parse(Console.ReadLine());
Console.Write("Nhap c: ");
c = int.Parse(Console.ReadLine());
if (a != 0)
{
Quadratic ptb2 = new Quadratic(a, b, c);
Roots r = ptb2.GiaiPhuongTrinh(a, b, c);
if (r.RootsNumber == 0)
{
Console.WriteLine("Phuong trinh vo nghiem");
}
else if (r.RootsNumber == 1)
{
Console.WriteLine("Phuong trinh co 2 nghiem kep x1 = x2 = {0}", r.Root1);
}
else
{
Console.WriteLine("Phuong trinh co hai nghiem phan biet: ");
Console.WriteLine("x1 = {0}", r.Root1);
Console.WriteLine("x2 = {0}", r.Root2);
}
}
}