> Please, i need some help :)

You need to install ruby on your computer.

If you use windows, you can use the one-click installer.

It usually installs into /ruby directory.

> When i opened the command line, and typed calc.rb, it said : "ruby
> calc.rb is not recognized as an internal or external command operable
> program or batch file".

Try "ruby calc.rb" as well. And "irb" too.

It should work on Windows as well.

Remember you need to first make ruby work, before you can run those 
scripts!

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