Initial commit

vscode/Chapter06/Ch06Ex02Inheritance/Ch06Ex02Inheritance.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>

vscode/Chapter06/Ch06Ex02Inheritance/Circle.cs

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+namespace Packt.Shared;
+
+public class Circle : Square
+{
+  public Circle() { }
+
+  public Circle(double radius) : base(width: radius * 2) { }
+
+  public double Radius
+  {
+    get
+    {
+      return height / 2;
+    }
+    set
+    {
+      Height = value * 2;
+    }
+  }
+
+  public override double Area
+  {
+    get
+    {
+      double radius = height / 2;
+      return Math.PI * radius * radius;
+    }
+  }
+}

vscode/Chapter06/Ch06Ex02Inheritance/Program.cs

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+using Packt.Shared;
+
+Rectangle r = new(height: 3, width: 4.5);
+WriteLine($"Rectangle H: {r.Height}, W: {r.Width}, Area: {r.Area}");
+
+Square s = new(5);
+WriteLine($"Square    H: {s.Height}, W: {s.Width}, Area: {s.Area}");
+
+Circle c = new(radius: 2.5);
+WriteLine($"Circle    H: {c.Height}, W: {c.Width}, Area: {c.Area}");

vscode/Chapter06/Ch06Ex02Inheritance/Rectangle.cs

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+namespace Packt.Shared;
+
+public class Rectangle : Shape
+{
+  public Rectangle() { }
+
+  public Rectangle(double height, double width)
+  {
+    this.height = height;
+    this.width = width;
+  }
+
+  public override double Area
+  {
+    get
+    {
+      return height * width;
+    }
+  }
+}

vscode/Chapter06/Ch06Ex02Inheritance/Shape.cs

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+namespace Packt.Shared;
+
+public abstract class Shape
+{
+  // fields
+  protected double height;
+  protected double width;
+
+  // properties
+  public virtual double Height
+  {
+    get
+    {
+      return height;
+    }
+    set
+    {
+      height = value;
+    }
+  }
+
+  public virtual double Width
+  {
+    get
+    {
+      return width;
+    }
+    set
+    {
+      width = value;
+    }
+  }
+
+  // Area must be implemented by derived classes
+  // as a read-only property
+  public abstract double Area { get; }
+}

vscode/Chapter06/Ch06Ex02Inheritance/Square.cs

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+namespace Packt.Shared;
+
+public class Square : Rectangle
+{
+  public Square() { }
+
+  public Square(double width) : base(height: width, width: width) { }
+
+  public override double Height
+  {
+    set
+    {
+      height = value;
+      width = value;
+    }
+  }
+
+  public override double Width
+  {
+    set
+    {
+      height = value;
+      width = value;
+    }
+  }
+}