Listing05.26.CatchingAnException.cs

namespace AddisonWesley.Michaelis.EssentialCSharp.Chapter05.Listing05_26;

#region INCLUDE
public class ExceptionHandling
{
    public static int Main(string[] args)
    {
        string? firstName;
        string ageText;
        int age;
        int result = 0;

        Console.Write("Enter your first name: ");
        firstName = Console.ReadLine();

        Console.Write("Enter your age: ");
        // Assume not null for clarity
        ageText = Console.ReadLine()!;

        try
        {
            age = int.Parse(ageText);
            Console.WriteLine(
                $"Hi { firstName }! You are { age * 12 } months old.");
        }
        catch(FormatException)
        {
            Console.WriteLine(
                $"The age entered, { ageText }, is not valid."); 
            result = 1;
        }
        catch(Exception exception)
        {
            Console.WriteLine(
                $"Unexpected error: { exception.Message }");
            result = 1;
        }
        finally
        {
            Console.WriteLine($"Goodbye { firstName }");
        }

        return result;
    }
}
#endregion INCLUDE