Question about encrypting

Question

Question is in the code

https://code.sololearn.com/c03jQ7R334ji/?ref=app

note => I did not make code public if you cant open it im gonna make it public.

Answer 1

Hope these documents help.

http://www.cplusplus.com/doc/ascii/

http://en.cppreference.com/w/cpp/language/ascii

Answer 2

You can add characters. They get converted to their ASCII code table number values, get added, then converted back.

char a = ' '
char b = 'a'
cout << a + b;

Output is 32 (space) + whatever 'latin small letter a' is as char form