Some questions about the source code

[RongNianXin]

You use a lot of std namespaces in your cpp source files, but to my surprise, your project doesn't have library functions like strcmp in std namespaces, while I created a new test file, which can be called directly by std::strcmp. So I'm so confusing, and I'm even more surprised that exit() also reports an error.

What's more, I can't open some of these project,Why?

[RongNianXin]

I am a beginner, I hope you can give me more guidance, I debug for 3 days in order to learn the source code, and now the program can not run, the software has also downloaded, can not use, I log in and can not find any icon of this software in SteamVR