class Program
    {
        class hesapmakinesi
        {
            public double toplama(double x, double y)
            {
                double sonuc;
                sonuc = x + y;
                return sonuc;
            }
            public double cikarma(double x, double y)
            {
                double sonuc;
                sonuc = x - y;
                return sonuc;
            }
            public double carpma(double x, double y)
            {
                double sonuc;
                sonuc = x * y;
                return sonuc;
            }
            public double bolme(double x, double y)
            {
                double sonuc;
                sonuc = x / y;
                return sonuc;
            }

            static void Main(string[] args)
            {
                hesapmakinesi hesap = new hesapmakinesi();
                double x = 100;
                double y = 40;
                double topla = hesap.toplama(x, y);
                double cikar = hesap.cikarma(x, y);
                double carp = hesap.carpma(x, y);
                double bol = hesap.bolme(x, y);
                Console.WriteLine(topla);
                Console.WriteLine(cikar);
                Console.WriteLine(carp);
                Console.WriteLine(bol);
                Console.ReadKey();
            }
        }
    }