WriteLine("Before parsing");
Write("What is your age? ");
string? input = ReadLine(); // or use "49" in a notebook

try
{
  int age = int.Parse(input!);
  WriteLine($"You are {age} years old.");
}
catch (OverflowException)
{
  WriteLine("Your age is a valid number format but it is either too big or small.");
}
catch (FormatException)
{
  WriteLine("The age you entered is not a valid number format.");
}
catch (Exception ex)
{
  WriteLine($"{ex.GetType()} says {ex.Message}");
}
WriteLine("After parsing");

Write("Enter an amount: ");
string amount = ReadLine()!;
if (string.IsNullOrEmpty(amount)) return;

try
{
  decimal amountValue = decimal.Parse(amount);
  WriteLine($"Amount formatted as currency: {amountValue:C}");
}
catch (FormatException) when (amount.Contains("$"))
{
  WriteLine("Amounts cannot use the dollar sign!");
}
catch (FormatException)
{
  WriteLine("Amounts must only contain digits!");
}