Initial commit

vscode/Chapter03/CastingConverting/CastingConverting.csproj

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+<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>

vscode/Chapter03/CastingConverting/Program.cs

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+using static System.Convert;
+
+int a = 10;
+double b = a; // an int can be safely cast into a double
+WriteLine(b);
+
+double c = 9.8;
+int d = (int)c;
+WriteLine(d); // d is 9 losing the .8 part
+
+long e = 5_000_000_000;
+int f = (int)e;
+WriteLine($"e is {e:N0} and f is {f:N0}");
+
+e = long.MaxValue;
+f = (int)e;
+WriteLine($"e is {e:N0} and f is {f:N0}");
+
+double g = 9.8;
+int h = ToInt32(g); // a method of System.Convert
+WriteLine($"g is {g} and h is {h}");
+
+// Understanding the default rounding rules
+
+double[] doubles = new[]
+  { 9.49, 9.5, 9.51, 10.49, 10.5, 10.51 };
+
+foreach (double n in doubles)
+{
+  WriteLine($"ToInt32({n}) is {ToInt32(n)}");
+}
+
+// Taking control of rounding rules
+
+foreach (double n in doubles)
+{
+  WriteLine(format:
+    "Math.Round({0}, 0, MidpointRounding.AwayFromZero) is {1}",
+    arg0: n,
+    arg1: Math.Round(value: n, digits: 0,
+            mode: MidpointRounding.AwayFromZero));
+}
+
+// Converting from any type to a string
+
+int number = 12;
+WriteLine(number.ToString());
+
+bool boolean = true;
+WriteLine(boolean.ToString());
+
+DateTime now = DateTime.Now;
+WriteLine(now.ToString());
+
+object me = new();
+WriteLine(me.ToString());
+
+// allocate array of 128 bytes
+byte[] binaryObject = new byte[128];
+
+// populate array with random bytes
+Random.Shared.NextBytes(binaryObject);
+
+WriteLine("Binary Object as bytes:");
+for (int index = 0; index < binaryObject.Length; index++)
+{
+  Write($"{binaryObject[index]:X} ");
+}
+WriteLine();
+
+// convert to Base64 string and output as text
+string encoded = ToBase64String(binaryObject);
+WriteLine($"Binary Object as Base64: {encoded}");
+
+int age = int.Parse("27");
+DateTime birthday = DateTime.Parse("4 July 1980");
+
+WriteLine($"I was born {age} years ago.");
+WriteLine($"My birthday is {birthday}.");
+WriteLine($"My birthday is {birthday:D}.");
+
+Write("How many eggs are there? ");
+string? input = ReadLine(); // or use "12" in notebook
+
+if (int.TryParse(input, out int count))
+{
+  WriteLine($"There are {count} eggs.");
+}
+else
+{
+  WriteLine("I could not parse the input.");
+}