Difference between i = ++i and ++i [duplicate]

Answer 1

i = ++i will often, but not necessarily, give the result of

i = i;

i +1;

which gives i = 10

As pointed out by the comments, this is undefined behaviour and should never be relied on

while ++i will ALWAYS give

i = i+1;

which gives i = 11;

And is therefore the correct way of doing it