69 lines
2.3 KiB
Markdown
69 lines
2.3 KiB
Markdown
# Hello World
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The classical introductory exercise. Just say "Hello, World!".
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["Hello, World!"](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program) is
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the traditional first program for beginning programming in a new language
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or environment.
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The objectives are simple:
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- Write a function that returns the string "Hello, World!".
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- Run the test suite and make sure that it succeeds.
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- Submit your solution and check it at the website.
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If everything goes well, you will be ready to fetch your first real exercise.
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## Setup
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Check out [Exercism Help](http://exercism.io/languages/common-lisp) for instructions to
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get started writing Common Lisp. That page will explain how to install and setup
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a Lisp implementation and how to run the tests.
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## Formatting
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While Common Lisp doesn't care about indentation and layout of code,
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nor whether you use spaces or tabs, this is an important consideration
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for submissions to exercism.io. Excercism.io's code widget cannot
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handle mixing of tab and space characters well so using only spaces is recommended to make
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the code more readable to the human reviewers. Please review your
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editors settings on how to accomplish this. Below are instructions for
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popular editors for Common Lisp.
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### VIM
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Use the following commands to ensure VIM uses only spaces for
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indentation:
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```vimscript
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:set tabstop=2
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:set shiftwidth=2
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:set expandtab
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```
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(or as a oneliner `:set tabstop=2 shiftwidth=2 expandtab`). This can
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be added to your `~/.vimrc` file to use it all the time.
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### Emacs
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Emacs is very well suited for editing Common Lisp and has many
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powerful add-on packages available. The only thing that one needs to
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do with a stock emacs to make it work well with exercism.io is to
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evaluate the following code:
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`(setq indent-tab-mode nil)`
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This can be placed in your `~/.emacs` (or `~/.emacs.d/init.el`) in
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order to have it set whenever Emacs is launched.
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One suggested add-on for Emacs and Common Lisp is
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[SLIME](https://github.com/slime/slime) which offers tight integration
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with the REPL; making iterative coding and testing very easy.
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## Source
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This is an exercise to introduce users to using Exercism [http://en.wikipedia.org/wiki/%22Hello,_world!%22_program](http://en.wikipedia.org/wiki/%22Hello,_world!%22_program)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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