Whats the difference between ++i and i++?

Answer 1

++i means first increment by one then assign the value & i++ means first assign the value then increment by one.

Answer 2

++i means pre-increment and
i++ means post-increment

Answer 3

1) Prefix form
y = ++x is equivalent to
x = x + 1
y =x

2) Postfix form
y = x++ is equivalent to
y = x
x = x + 1