#Mastery 19

Validated user input Validating what the user writes can be more simple than what you think. Here´s an example, and you will notice that you have been doing it without knowing: Ask you can see it is what you´ve been doing all the time when codying a program. Here is another example: References: https://stackoverflow.com/questions/23294658/asking-the-user-for-input-until-they-give-a-valid-response

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