Write("Enter a number between 0 and 255: ");
string n1 = ReadLine()!;

Write("Enter another number between 0 and 255: ");
string n2 = ReadLine()!;

try
{
  byte a = byte.Parse(n1);
  byte b = byte.Parse(n2);

  int answer = a / b;

  WriteLine($"{a} divided by {b} is {answer}");
}
catch (Exception ex)
{
  WriteLine($"{ex.GetType().Name}: {ex.Message}");
}