static void Main(string[] args)
{
try
{
TCircle c = new TCircle(2, 5, 4);
TCircle c1 = new TCircle(2, 5, 4);
Console.WriteLine($"S={c.S()}");
Console.WriteLine($"{c.Belong()}");
Console.WriteLine($"Add :{c + c1}");
Console.WriteLine($"Sub :{c - c1}");
Console.WriteLine($"Mul :{c * c1}");
}
catch
{
Console.WriteLine("Number of point must be positive!!!");
}
}
public TCircle(TCircle b)
{
this.r = b.r;
this.x = b.x;
this.y = b.y;
}