After eight days, I have been able to sail through the calculator project. It has been a hectic challenge. I have been mainly a backend programmer(Microsoft Visual Basic 6 , Crystal Report, c# and MS SQL Server) for many years. After this calculator project, I have started respecting frontend programmers. I have even started developing interest in frontend programming.
Congratulations on completing the project. As a front end developer who takes a lot of from back end developers, these stories always warm my cold, dead, heart.