cs11dotnet7/vscode/Chapter03/SelectionStatements/Program.cs

string password = "ninja";
if (password.Length < 8)
{
  WriteLine("Your password is too short. Use at least 8 characters.");
}
else
{
  WriteLine("Your password is strong.");
}

// add and remove the "" to change the behavior
object o = 3;
int j = 4;

if (o is int i)
{
  WriteLine($"{i} x {j} = {i * j}");
}
else
{
  WriteLine("o is not an int so it cannot multiply!");
}

int number = Random.Shared.Next(1, 7);
WriteLine($"My random number is {number}");

switch (number)
{
  case 1:
    WriteLine("One");
    break; // jumps to end of switch statement
  case 2:
    WriteLine("Two");
    goto case 1;
  case 3: // multiple case section
  case 4:
    WriteLine("Three or four");
    goto case 1;
  case 5:
    goto A_label;
  default:
    WriteLine("Default");
    break;
} // end of switch statement
WriteLine("After end of switch");
A_label:
WriteLine($"After A_label");

// string path = "/Users/markjprice/cs11dotnet7/Chapter03";
string path = @"C:\cs11dotnet7\Chapter03";
Stream? s;

Write("Press R for read-only or W for writeable: ");
ConsoleKeyInfo key = ReadKey();

if (key.Key == ConsoleKey.R)
{
  s = File.Open(
    Path.Combine(path, "file.txt"),
    FileMode.OpenOrCreate,
    FileAccess.Read);
}
else
{
  s = File.Open(
    Path.Combine(path, "file.txt"),
    FileMode.OpenOrCreate,
    FileAccess.Write);
}
WriteLine();

string message;
switch (s)
{
  case FileStream writeableFile when s.CanWrite:
    message = "The stream is a file that I can write to.";
    break;
  case FileStream readOnlyFile:
    message = "The stream is a read-only file.";
    break;
  case MemoryStream ms:
    message = "The stream is a memory address.";
    break;
  default: // always evaluated last despite its current position
    message = "The stream is some other type.";
    break;
  case null:
    message = "The stream is null.";
    break;
}
WriteLine(message);

message = s switch
{
  FileStream writeableFile when s.CanWrite
    => "The stream is a file that I can write to.",
  FileStream readOnlyFile
    => "The stream is a read-only file.",
  MemoryStream ms
    => "The stream is a memory address.",
  null
    => "The stream is null.",
  _
    => "The stream is some other type."
};
WriteLine(message);