6.15. Ruby comment

发布时间 :2023-10-25 23:00:07 UTC      

Comments are comment lines within Ruby code that are ignored at run time. A single-line comment begins with the # character and ends with the line, as follows:

6.15.1. Example #

#!/usr/bin/ruby -w#This is a single line comment.puts"Hello, Ruby!"

When executed, the above program produces the following results:

Hello, Ruby!

Ruby multiline comment #

You can use the =begin and =end the syntax comment is multiline, as follows:

6.15.2. Example #

#/ Usr/bin/ruby wputs "Hello, Ruby!"=begin This is a multi line comment.
Expandable to any number of rows. But=begin and=end
Can only appear on the first and last lines= End

When executed, the above program produces the following results:

Hello, Ruby!

Make sure that the trailing comments are sufficiently distant from the code to make it easy to distinguish between comments and code. If the tail has more than one comment, align them. For example:

6.15.3. Example #

@counter#Track the number of clicks on a
page@siteCounter#Track the number of clicks on all pages

Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.