what is difference between ++i and i+=1 from any point of view

Question

This is a question from kn king\'s c programming : a modern approach. I can\'t understand the solution given by him:-

The expression ++i is equivalent to (i          


        

Answer 1

++i is the pre-increment operator. It increments i before setting and returning the value (which is obviously i + 1).

Now, i++ is the post-increment operator. It increments i after the whole instruction it appears in is evaluated.

Example:

int i = 0;
std::cout << ++i << std::endl; /* you get 1 here */
std::cout << i++ << std::endl; /* you still get 1 here */
std::cout << i << std::endl;   /* you get 2 here */