Hello World for Ruby beginners
This article mainly introduces Hello World, a Ruby beginner's note. This article uses common methods, functions, and classes to output Hello World, for more information about Ruby programming, see
NOTE: For the Ruby Windows installation package, go to http://rubyinstaller.org/download to install it.
I installed Ruby193 and wrote the first Ruby program to record my learning experience.
Create a folder Sample in Ruby and add a new file named HelloWorld. rb.
The content is:
The Code is as follows:
Puts "Hello, World! "
Of course, you can declare the variable first, for example, then use the puts statement.
The Code is as follows:
A = "Hello, World! "
Puts
Of course, you can also write a function before calling it for output.
The Code is as follows:
Def say (name)
"Hello, # {name }"
End
Puts say ("World! ")
Considering that Ruby is fully object-oriented, you can also write a class and then call the object method in the class to complete the process.
The Code is as follows:
Class Hello
Attr_reader: msg
Def initialize
@ Msg = "Hello, World"
End
End
H = Hello. new
Puts h. msg
Print "Press RETURN"
$ Stdin. gets
Run as follows:
The Code is as follows:
C: \ Ruby193 \ Sample> ruby HelloWorld. rb
Hello, World!