Initial commit

vscode/Chapter03/SelectionStatements/Program.cs

@@ -0,0 +1,106 @@
+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);

vscode/Chapter03/SelectionStatements/SelectionStatements.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<Using Include="System.Console" Static="true" />
+	</ItemGroup>
+
+</Project>