Hello World for Ruby beginners

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!