NOTE: You may download codes and extra source material for this book from https://bookofengineering.com/easyseries/

The “//” sign means you are adding a comment. This is called line comment. The things you write after these “//” will not be taken as a command (means these things will not be compiled). It is always a good approach to write down the properties of the code at the beginning like author, for which aim this code is written etc.