Tests c++ online

That's a topic I want to open, I suggest here to throw links to free online tests for C++, also propose to discuss some interesting puzzles of these tests.

Why is it necessary? Quite simply, I think there are many among us beginners and not so young specialists in the field of C++, who want to
A) To increase their level of qualification
B) Understand what they are worth as professionals

A test is a very good way to learn something new, because these little puzzles allow escape from the heavy projects with a complex subject area directly in C++.

Here are just three of my links, though there is no interactivity, it's about html, so the results will have to take it for.

Here's a link from me:
http://itester.org
I'd suggest to apply for an actual job position. It usually involves as first step an online test like those you are mentioning PLUS a free correction :)
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