a) make a list of five or more usernames called current_users  b) request the number of users c) request each username of the number of users d) make another list, new_users. Make sure one or two of the new usernames are also in the current_users list e) loop through the new_users list to see if each new username has already been used f) print a message, the person will need to enter a new username if the username has already been used g) print a message, the username is still available if the username has not been used h) Make sure your comparison is case insensitive. If 'John' has been used, 'JOHN' or ‘john’ should not be accepted.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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  1. a) make a list of five or more usernames called current_users 
  2. b) request the number of users
  3. c) request each username of the number of users
  4. d) make another list, new_users. Make sure one or two of the new usernames are also in the current_users list
  5. e) loop through the new_users list to see if each new username has already been used
  6. f) print a message, the person will need to enter a new username if the username has already been used
  7. g) print a message, the username is still available if the username has not been used
  8. h) Make sure your comparison is case insensitive. If 'John' has been used, 'JOHN' or ‘john’ should not be accepted.
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