C# 0 The Complete Reference

PART I

C h a p t e r   1 1 :  

I n h e r i t a n c e  

287

PART IPART I

  // Constructor.

  public Triangle(string s, double w, double h) : base(w, h) {

    Style = s;

  }

  // Construct an isosceles triangle.

  public Triangle(double x) : base(x) {

    Style = "isosceles";

  }

  // Return area of triangle.

  public double Area() {

    return Width * Height / 2;

  }

  // Display a triangle's style.

  public void ShowStyle() {

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

  }

}

// Extend Triangle.

class ColorTriangle : Triangle {

  string color;

  public ColorTriangle(string c, string s,

                       double w, double h) : base(s, w, h) {

    color = c;

  }

  // Display the color.

  public void ShowColor() {

    Console.WriteLine("Color is " + color);

  }

}

class Shapes6 {

  static void Main() {

    ColorTriangle t1 =

         new ColorTriangle("Blue", "right", 8.0, 12.0);

    ColorTriangle t2 =

         new ColorTriangle("Red", "isosceles", 2.0, 2.0);

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

    t1.ShowStyle();

    t1.ShowDim();

    t1.ShowColor();

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

    Console.WriteLine();

    Console.WriteLine("Info for t2: ");

    t2.ShowStyle();

    t2.ShowDim();

    t2.ShowColor();

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P a r t   I :  

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    Console.WriteLine("Area is " + t2.Area());

  }

}

The output of this program is shown here:

Info for t1:

Triangle is right

Width and height are 8 and 12

Color is Blue

Area is 48

Info for t2:

Triangle is isosceles

Width and height are 2 and 2

Color is Red

Area is 2

Because of inheritance,