prefix/suffix increment [duplicate]

Answer 1

The prefix ++i and suffix i++ operators affect the order in which the statement is evaluated. With the prefix ++i, the value of i is incremented, and that is what is used. But with the suffix i++, the original value of i is used, and then it is incremented for anything following that line.

Answer 2

1) Pretty obviously, "++i" increments the variable first, and "i++" increments afterward.

2) Less obviously, complex expressions mixing infix increment/decrement with other operations on the same variable can introduce undefined behavior:

• http://en.wikipedia.org/wiki/Sequence_point

I agree: the thread Post-increment and Pre-increment concept? addresses this question.