Answers for "latex line comment"

latex long comments

documentclass{article}
usepackage{verbatim}	%You can use long comments from this package
begin{document}
    This text will be displayed
begin{comment}
    This text will not be displayed.
end{comment}
end{document}

latex block comment

...
longdef/*#1*/{}		% don't forget this line
...

begin{document}

/* This is a block-
	comment over
    multiple lines
    in latex
*/