using System;

public class Program

{

public static void Main()

        {

            try {              

                int result = new Work().DoWorkA();              

                Console.ReadLine();

            }

            catch (Exception ex){

                //log exception here

                Console.WriteLine(ex);

                Console.ReadLine();

            }

        }

​

        public class Work

        {

            public int DoWorkA()

            {

                try {

                    int denominator = new Random().Next(0, 5); //can be 0,1,2,3,4

                    int transactionType = new Random().Next(1, 5); //can be 1,2,3,4

                    int result = DoWorkB(transactionType, denominator);

                    return result;

                }

                catch (Exception ex) {

                    throw ex;

                }

            }

​

            private int DoWorkB(int transactionType, int denominator)

            {

                int result = 0;

                //should not accept 1 as an transactionType.

                //if transactionType is 0, should exit from code indicating an error.

                if (transactionType == 1) {

                    return -1;

                }

                else if (transactionType == 2) {

                    result = 100 / denominator;

                }

                else if (transactionType == 3){

                    throw new Exception();

                }

                return result;

            }

        }

}

​