/* C#: The Complete Reference by Herbert Schildt Publisher: Osborne/McGraw-Hill (March 8, 2002) ISBN: 0072134852 */ // Add a constructor to Triangle. using System; // A class for two-dimensional objects. class TwoDShape { double pri_width; // private double pri_height; // private // properties for width and height. public double width { get { return pri_width; } set { pri_width = value; } } public double height { get { return pri_height; } set { pri_height = value; } } public void showDim() { Console.WriteLine("Width and height are " + width + " and " + height); } } // A derived class of TwoDShape for triangles. class Triangle : TwoDShape { string style; // private // Constructor public Triangle(string s, double w, double h) { width = w; // init the base class height = h; // init the base class style = s; // init the derived class } // Return area of triangle. public double area() { return width * height / 2; } // Display a triangle's style. public void showStyle() { Console.WriteLine("Triangle is " + style); } } public class Shapes3 { public static void Main() { Triangle t1 = new Triangle("isosceles", 4.0, 4.0); Triangle t2 = new Triangle("right", 8.0, 12.0); Console.WriteLine("Info for t1: "); t1.showStyle(); t1.showDim(); Console.WriteLine("Area is " + t1.area()); Console.WriteLine(); Console.WriteLine("Info for t2: "); t2.showStyle(); t2.showDim(); Console.WriteLine("Area is " + t2.area()); } }