C# 0 The Complete Reference

TwoDShape

 class that makes 

Width

 and 

Height

 into properties. 

In the process, it ensures that the values of 

Width

 and 

Height

 will be positive. This would 

allow you, for example, to specify the 

Width

 and 

Height

 using the coordinates of the shape 

in any quadrant of the Cartesian plane without having to first obtain their absolute values.

// Use public properties to set and get private members.

using System;

// A class for two-dimensional objects.

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class TwoDShape {

  double pri_width;  // now private

  double pri_height; // now private

  // Properties for width and height.

  public double Width {

     get { return pri_width; }

     set { pri_width = value < 0 ? -value : value; }

  }

  public double Height {

     get { return pri_height; }

     set { pri_height = value < 0 ? -value : value; }

  }

  public void ShowDim() {

    Console.WriteLine("Width and height are " +

                       Width + " and " + Height);

  }

}

// A derived class of TwoDShape for triangles.

class Triangle : TwoDShape {

  public string Style; // style of triangle

  // Return area of triangle.

  public double Area() {

    return Width * Height / 2;

  }

  // Display a triangle's style.

  public void ShowStyle() {

    Console.WriteLine("Triangle is " + Style);

  }

}

class Shapes2 {

  static void Main() {

    Triangle t1 = new Triangle();

    Triangle t2 = new Triangle();

    t1.Width = 4.0;

    t1.Height = 4.0;

    t1.Style = "isosceles";

    t2.Width = 8.0;

    t2.Height = 12.0;

    t2.Style = "right";

    Console.WriteLine("Info for t1: ");

    t1.ShowStyle();

    t1.ShowDim();

    Console.WriteLine("Area is " + t1.Area());

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