what is a single line comment?

Answer 1

single line coment must be on one line;

Answer 2

A single line comment is a line of comment.
It is done by // sign. It does not need a closure as it ends with the end of the single line.
Multiple line comment is done by /* at the start and */ at the end

Answer 3

Single line comment means done on single line. It is represented by // sign. Multi line comment represented by*/....................... */