In the table of escape sequences, I can notice that escaping a question mark is required, and done with \?.
Why is this required? looks like the following code runs without errors or warnings:
printf("a?B\n");
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iTayb
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What table is that? Can you provide a link to it? – Iharob Al Asimi Mar 13 '15 at 17:51
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Wikipedia, for example... edited the question with a link. – iTayb Mar 13 '15 at 17:52