String functions in C++. So far, we've gone over how to access, append, remove, and update characters within a string. Outside of these methods, we can utilize the built-in cctype library in C++ to classify and transform characters within a string. Specifically, we will be using the tolower and toupper functions to convert a character to lowercase or uppercase. We will use this to create a program that checks an input username that is case insensitive. In addition, we will use the islower, isupper, isdigit, isalnum functions to create a program for verifying whether or not a password meets character requirements.

If you need to review past C++ Topics:
Useful Math Functions: https://youtu.be/WmsXJcHCHSs
Break and Continue: https://youtu.be/WJ2RQaj4Mvk
Strings and C Strings: https://youtu.be/-1muiZieHTA

List of string character functions in the ctype library:
https://cplusplus.com/reference/cctype/

C++ Playlist:
https://www.youtube.com/playlist?list=PLnKe36F30Y4ZDNIOZ51sX25pWKQ1pkpTE

Github Repo for C++ Code:
https://github.com/ImKennyYip/cpp

Install C++ with VS Code:
https://youtu.be/DMWD7wfhgNY

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