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Q1:C Q2:A Q3:C Q4:D Q5:A

And when I saw answers I smiled, Right! because he didnt specified platform.

Yeah C can be devious, but I still love it! Its my favorite language. And Ruby for scripting.

I knew they were all UB except the integer promotion one. Ah well, at least I have -Wconversion turned on to save me from myself on that one.