syntax.txt

Python          .py            #
                               """    """
Ruby            .rb            =begin    =end


EASIEST:
R               .r             # 
Perl            .pl            #    
CoffeeScript    .coffee        #    
Haskell         .hs            --             


NOT HARD:
HTML            .html          <!--     -->    
Javascript      .js            //
                               /*       */
Java            .java          //
                               /*       */
                               /**      */
CSS             .css           /*       */
PHP             .php           #
                               //
                               /*       */
C               .c             //
                               /*       */
Scala           .scala         /*       */    


OTHER:
Matlab          .m             %              (whole line)
                               ...       ... (part of a line)
C++