How do you make a comment in different languages?

Question

I think one language (Java?) uses // before the line, others (like cmd commands on the computer) use a keyword, as I recall. How do you null a line into a comment, rather than active code? Please give specific examples, naming the language which uses it.

Answer 1

C# also use // for one line coment

Answer 2

To each language its own.
some use #.
some //
some *
some /*..... bla bla blal */

In Cobol its specificly * on position 6 of the line.

Answer 3

# MASM single line

comment *

multi-line

*

Answer 4

python #

Answer 5

easy