Comment

Comment is very important for programmer. Every languages have a comment. This is a comment of some language:

1. Visual Basic
   
   • single line '
2. PHP
   
   • single line //
   • block /* block comment */
3. Javascript
   • single line //
   • block /* block comment */
4. XML
   • single line //
   • block /* block comment */
5. HTML
   • block <!-- block comment -->