static void Main(string[] args)
{
PS t = new PS();
t.Nhap(); t.hien();
PS t2 = new PS();
t2.Nhap(); t2.hien();
PS t3 = t + t2; t3.hien();
PS t4 = t * t2; t4.hien();
if (t > t2)
{
Console.WriteLine("ps t1>t2");
}
else if (t < t2)
{
Console.WriteLine("ps t1<t2S");
}
else
{
Console.WriteLine("hai ps = nhau");
}
Console.ReadKey();
}
