Object-Oriented Programming/Inheritance/C Sharp
main.cs
edit// This program demonstrates use of the Polygon, Triangle, Rectangle, and Square classes.
using System;
class Program
{
public static void Main (string[] args)
{
ProcessPolygons();
ProcessShapes();
}
private static void ProcessPolygons()
{
var triangle = new Polygon(new double[] {3, 4, 5});
DisplaySides("triangle", triangle.Sides);
Console.WriteLine("triangle perimeter: " + triangle.Perimeter.ToString());
var rectangle = new Polygon(new double[] {4, 2, 4, 2});
DisplaySides("rectangle", rectangle.Sides);
Console.WriteLine("rectangle perimeter: " + rectangle.Perimeter.ToString());
var square = new Polygon(new double[] {2, 2, 2, 2});
DisplaySides("square", square.Sides);
Console.WriteLine("square perimeter: " + square.Perimeter.ToString());
}
private static void ProcessShapes()
{
var triangle = new Triangle(new double[] {3, 4, 5});
DisplaySides("triangle", triangle.Sides);
Console.WriteLine("triangle perimeter: " + triangle.Perimeter.ToString());
Console.WriteLine("triangle area: " + triangle.Area.ToString());
var rectangle = new Rectangle(new double[] {4, 2, 4, 2});
DisplaySides("rectangle", rectangle.Sides);
Console.WriteLine("rectangle perimeter: " + rectangle.Perimeter.ToString());
Console.WriteLine("rectangle area: " + rectangle.Area.ToString());
var square = new Square(new double[] {2, 2, 2, 2});
DisplaySides("square", square.Sides);
Console.WriteLine("square perimeter: " + square.Perimeter.ToString());
Console.WriteLine("square area: " + square.Area.ToString());
}
private static void DisplaySides(string label, double[] sides)
{
Console.Write(label + " sides: ");
for (var i = 0; i < sides.Length; i++) {
Console.Write(sides[i].ToString() + " ");
}
Console.WriteLine();
}
}
polygon.cs
edit// Supports polygon calculations for perimeter and area.
using System;
public class Polygon
{
private double[] _sides;
// Creates a polygon object.
public Polygon(double[] sides)
{
this._sides = sides;
}
// Gets the polygon sides.
public double[] Sides
{
get
{
return this._sides;
}
set
{
this._sides = value;
}
}
// Gets the polygon perimeter.
public double Perimeter
{
get
{
double perimeter = 0.0;
for (var i = 0; i < this.Sides.Length; i++) {
perimeter += this.Sides[i];
}
return perimeter;
}
}
}
public class Triangle : Polygon {
public Triangle(double[] sides) : base(sides)
{
// Calling base constructor
}
// Gets the area of the triangle.
// References:
// https://www.mathsisfun.com/geometry/herons-formula.html
public double Area {
get
{
var s = this.Perimeter / 2;
var a = this.Sides[0];
var b = this.Sides[1];
var c = this.Sides[2];
var area = Math.Sqrt(s * (s - a) * (s - b) * (s - c));
return area;
}
}
}
public class Rectangle : Polygon {
public Rectangle(double[] sides) : base(sides)
{
// Calling base constructor
}
// Gets the area of the rectangle.
public double Area {
get
{
var length = this.Sides[0];
var width = this.Sides[1];
if (length == width) {
// Allow for sides in any order.
width = this.Sides[2];
}
var area = length * width;
return area; }
}
}
public class Square : Polygon {
public Square(double[] sides) : base(sides)
{
// Calling base constructor
}
// Gets the area of the square.
public double Area {
get
{
var side = this.Sides[0];
var area = side * side;
return area;
}
}
}
Try It
editCopy and paste the code above into one of the following free online development environments or use your own C Sharp compiler / interpreter / IDE.