Eclipse: syntax highlighting disappeared for one of my files

Question

I was trying to close unused files in Eclipse and accidentally made something wrong. Now I can\'t see syntax highlighting for one of my files. Here are two screenshots - on

Answer 1

I guess you accidentally opened the file with the 'Text Editor'. Refer screenshot below.

Answer 2

In C/C++ is also a scalability mode which disable syntax highlighting if the file has more than 5000 lines.