C++ threads

Question

Hi, I’m trying to learn about threads in C++ and I can’t figure out who this code isn’t working. Can anyone help?
https://code.sololearn.com/cvuWenwlxg5P/?ref=app
This is the site I’m using:
https://solarianprogrammer.com/2011/12/16/cpp-11-thread-tutorial/

Answer 1

Ok thanks

Answer 2

c++ threads = threats