While I agree the code presented is just, plain and simple, bad, and the first way to the solution is splitting it up, I really don't get why you want comments

While I agree the code presented is just, plain and simple, bad, and the first way to the solution is splitting it up, I really don't get why you want comments for every line? Or don't you mean literally every line maybe? I mean suppose I split the first part of the statement like this: int r = a[ i ]; ++i; These lines are self-explanatory. It's pretty hard to argue they need a comment? Especially when used in a function that already should have a name/comment explaining what it does?