When do we need to add comment to our codes

Question

when is comment necessary in our coding

Answer 1

just good practice. helps others know what you were doing with each part of your code. also helps you when you go back and look at it after a few weeks. don't have to wonder wth you were trying to do

Answer 2

you can add them in wherever you want to. comments can go anywhere they are specified.

Answer 3

don't know it

Answer 4

I comment my codes with the algorithm I use in it. I don't comment things like
s++; // increment s
instead i do
s++; // check next number