[Ruby on Rails] Deep (2) Ruby Basic syntax

1. Debug & comment & Print output debug

Ruby is an interpreted language, a script, and on Linux, scripts cannot be executed in three ways:

1. Run the script with the interpreter

Interpreter  script File

That is:Ruby script File

2. Run the script directly

In the script file, use the

#! Script Interpreter

Define the script interpreter path, then grant the script execute permission, then run directly

./script File

Can.

3. Run the script inside the interpreter

[Email protected]:/home/ywt/ror_tests/ruby_tests# irb2.1.5:001 > str = "SDFSDF" = "SDFSDF" 2.1.5:002 > puts str SDFSDF = nil2.1.5:003 > Print strsdfsdf = nil2.1.5:004 >

PS: Suggested directly with the first, the second is more troublesome, the third is more ugly (of course try syntax can use this)

Comments

Coment.rb

#single line commentstr = ' Hello World ' =beginthis are a test ofmutiple line comments=endputs str

The test output is as follows:

[Email protected]:/home/ywt/ror_tests/ruby_tests# Ruby Comment.rbhello World

That

#单行注释

=begin Multi-line Comment =end

Print output

Print_test.rb

str = ' Hello World ' puts Strprint strputs ' ========= '

Test output

[Email protected]:/home/ywt/ror_tests/ruby_tests# Ruby Print_test.rbhello Worldhello World =========

That

Puts  str  =  print str  + print New_line  

(New_line under Windows is ' \ r \ n ', Linux above is ' \ n ')

Class General definition

Class Aclassend

Note: The first letter of a class name must be capitalized! (Python does not require this)

General definition of inheritance

Class Child<fatherend

That is, the inheritance character is ' < ';

Question: Do you support multiple inheritance?

Member member variable member function

[Ruby on Rails] Deep (2) Ruby Basic syntax