static void Main(string[] args)
        {
            // public void declareVar()
            {
                int        a, b;
                Sum        s = new Sum();
                Difference d = new Difference();
                Product    p = new Product();
                Quotient   q = new Quotient();
                Remainder  r = new Remainder();
                Input      i = new Input();
                a = i.number1();
                b = i.number2();
                Console.WriteLine("\nSum:\t\t\t" + s.getSum(a, b));
                Console.WriteLine("\nDifference:\t\t" + d.getDifference(a, b));
                Console.WriteLine("\nProduct:\t\t" + p.getProduct(a, b));
                Console.WriteLine("\nQuotient:\t\t" + q.getQuotient(a, b));
                Console.WriteLine("\nRemainder:\t\t" + r.getRemainder(a, b));

                Console.ReadLine();
            }
        }