static void Main(string[] args)
{
try
{
TCircle tc1 = new TCircle(2);
TCylinder tcy1 = new TCylinder(2, 10);
Console.WriteLine("num=");
double num = Convert.ToDouble(Console.ReadLine());
Console.WriteLine($"S={tc1.S()}");
Console.WriteLine($"C={tc1.C()}");
Console.WriteLine($"V={tcy1.V()}");
Console.WriteLine($"Add :{tc1 + num}");
Console.WriteLine($"Sub :{tc1 - num}");
Console.WriteLine($"Mul :{tc1 * num}");
}
catch
{
Console.WriteLine("Number of point must be positive!!!");
}
}
public TCircle(TCircle b)
{
this.r = b.r;
}
