Initial commit

vscode/Chapter08/WorkingWithNumbers/Program.cs

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+using System.Numerics;
+
+WriteLine("Working with large integers:");
+WriteLine("-----------------------------------");
+
+ulong big = ulong.MaxValue;
+WriteLine($"{big,40:N0}");
+
+BigInteger bigger =
+  BigInteger.Parse("123456789012345678901234567890");
+WriteLine($"{bigger,40:N0}");
+
+WriteLine("Working with complex numbers:");
+
+Complex c1 = new(real: 4, imaginary: 2);
+Complex c2 = new(real: 3, imaginary: 7);
+Complex c3 = c1 + c2;
+
+// output using default ToString implementation
+WriteLine($"{c1} added to {c2} is {c3}");
+
+// output using custom format
+WriteLine("{0} + {1}i added to {2} + {3}i is {4} + {5}i",
+  c1.Real, c1.Imaginary,
+  c2.Real, c2.Imaginary,
+  c3.Real, c3.Imaginary);
+

vscode/Chapter08/WorkingWithNumbers/WorkingWithNumbers.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<Using Include="System.Console" Static="true" />
+	</ItemGroup>
+
+</Project>