The first style of formatting seems to be much more popular than the second. Why is that?
The first (asterisk on every line)
/*
* line 1
* line 2
* line 3
*/
The second (the minimum amount of asterisks)
/*
line 1
line 2
line 3
*/
Probably because it is more readable, in case the comment has a lot of rows you know you are reading a comment even if you do not see the end.