using System;

namespace thisConstructor
{
    class classThis
    {
        int a, b, c;

        public classThis()
        {
            this.a = 5425;
            Console.WriteLine("classThis()");
        }

        public classThis(int b) : this()
        {
            this.b = b;
            Console.WriteLine("classThis({0})", b);
        }

        public classThis(int b, int c) : this(b)
        {
            this.c = c;
            Console.WriteLine("classThis({0}, {1})", b, c);
        }

        public void PrintFields()
        {
            Console.WriteLine("a:{0}, b:{1}, c:{2}", a, b, c);
        }
    }

    class MainApp
    {
        static void Main(string[] args)
        {
            classThis a = new classThis();
            a.PrintFields();
            Console.WriteLine();

            classThis b = new classThis(1);
            b.PrintFields();
            Console.WriteLine();

            classThis c = new classThis(10, 20);
            c.PrintFields();
        }
    }
}