using System;

public class Test
{
	public static void Main()
	{
		var s = new Shape(1.0, 1.2);
		Console.WriteLine(s.NumberOfSides);
	}
}
public class Shape
{ 
    // Keyword Initialized
    // ↓↓
    readonly double PI = 3.1416;
    public readonly int NumberOfSides;
    // ↑↑

    // Keyword Not initialized
    public Shape(double side1, double side2) // Constructor
    {

        // Shape is a rectangle
        NumberOfSides = 4;
        // ↑
        // ... Set in constructor
    }
    public Shape(double side1, double side2, double side3) // Constructor
    {
        // Shape is a triangle
        NumberOfSides = 3;
        // ↑
        // ... Set in constructor
    }
}