Initial commit

vs4win/Chapter04/Debugging/Debugging.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>

vs4win/Chapter04/Debugging/Program.cs

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+double a = 4.5;
+double b = 2.5;
+double answer = Add(a, b);
+
+WriteLine($"{a} + {b} = {answer}");
+WriteLine("Press ENTER to end the app.");
+ReadLine(); // wait for user to press ENTER
+
+double Add(double a, double b)
+{
+  return a + b; // deliberate bug!
+}