The project is to build a calculator:
1- Ask the user for two inputs and store them.
2- Ask the user to choose one of the available operations.
3- Perform the chosen operation and print the answer.
4- Ask the user if he wants to try again.
5- If the user type y: repeat all the steps, otherwise print: "the end".

These steps are enough to build the calculator. however, sometimes the user might type something unexpected by mistake. It would be nicer if the program knows what to do in such cases.
1- When asking the user to choose an operation: The program should start again if the user typed anything other than the available operations.
2- When asking the user if he wants to try again: The program should keep asking him the question until he provides one of the answers we need(y or n).

Bonus: We can also prevent an Input mismatch exception from occurring when we ask the user to type two inputs. If the user typed anything but a number, then we should handle this exception and ask him to re-enter his inputs.

Blas Emiliano Téllez Soto

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