Eclipse CDT Autocomplete not working

Question

I remember from some time ago that Eclipse had auto-complete when you type, and now I can only get it when pressing Ctrl + Space. I already checked and

Answer 1

This question is so valid even in 2018 with eclipse photon.

1) Go to Window > Prefrences > C/C++ > Editor > Content Assist > Advanced.

2) Check "Parsing-based proposal(Task-focused)".

3) Bind a key now by pressing "Ctrl + Space".