How to define Russian character in string?

Question

Programming

Good day! I'm doing term paper for uni. Course topic "Code editor with SDL 2 syntax highlighting". I store the character in the class, since at the input it is possible to determine the Russian character due to the size. But what to do when reading a file? How can I determine that this is a Russian character if I receive a string of type string?
Example:
"testosteron"
How can you determine that 4 characters are Russian, because string stores 1 byte. wstring doesn't work properly on linux for some reason. There is an idea to determine by character code to distinguish Unicode. What can experienced developers advise?

Answer 1

Any string is an array of char. Those. if you are getting a single character string, then you can pull out the char via string[0].