C++ Stage 1 Challenge Quiz

How it works
– Every attempt: 20 questions mixed from all Stage 1 lessons (easy, medium and hard).
– After each answer: press Check. If you are wrong, read the hint and try once more, then read the explanation.
– Every new attempt brings questions you have not seen yet.
– Your best score is saved. Your goal: 80% or more.
Tip: trace the code line by line on paper before you choose an answer.