printf("%d %d %d %d %d %d",i++,i–,++i,–i,i);
Just skip this question. There is no point in solving these question. They depend on compiler for answer. https://discuss.codechef.com/questions/128555/increment-operator-behaviour/128565
I would like to suggest you to go through this article and next time differentiate between title and question.
Are you sure you know the difference between “Title” of question and Question itself?