Rewrite with jekyll

.gitignore

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+_site
+.sass-cache
+.jekyll-metadata

Gemfile

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+source "https://rubygems.org"
+ruby RUBY_VERSION
+
+# Hello! This is where you manage which Jekyll version is used to run.
+# When you want to use a different version, change it below, save the
+# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
+#
+#     bundle exec jekyll serve
+#
+# This will help ensure the proper Jekyll version is running.
+# Happy Jekylling!
+gem "jekyll", "3.4.3"
+
+# This is the default theme for new Jekyll sites. You may change this to anything you like.
+gem "minima", "~> 2.0"
+
+# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
+# uncomment the line below. To upgrade, run `bundle update github-pages`.
+# gem "github-pages", group: :jekyll_plugins
+
+# If you have any plugins, put them here!
+group :jekyll_plugins do
+   gem "jekyll-feed", "~> 0.6"
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
+

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.5.1)
+      public_suffix (~> 2.0, >= 2.0.2)
+    colorator (1.1.0)
+    ffi (1.9.18)
+    forwardable-extended (2.6.0)
+    jekyll (3.4.3)
+      addressable (~> 2.4)
+      colorator (~> 1.0)
+      jekyll-sass-converter (~> 1.0)
+      jekyll-watch (~> 1.1)
+      kramdown (~> 1.3)
+      liquid (~> 3.0)
+      mercenary (~> 0.3.3)
+      pathutil (~> 0.9)
+      rouge (~> 1.7)
+      safe_yaml (~> 1.0)
+    jekyll-feed (0.9.2)
+      jekyll (~> 3.3)
+    jekyll-sass-converter (1.5.0)
+      sass (~> 3.4)
+    jekyll-watch (1.5.0)
+      listen (~> 3.0, < 3.1)
+    kramdown (1.13.2)
+    liquid (3.0.6)
+    listen (3.0.8)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    mercenary (0.3.6)
+    minima (2.1.1)
+      jekyll (~> 3.3)
+    pathutil (0.14.0)
+      forwardable-extended (~> 2.6)
+    public_suffix (2.0.5)
+    rb-fsevent (0.9.8)
+    rb-inotify (0.9.8)
+      ffi (>= 0.5.0)
+    rouge (1.11.1)
+    safe_yaml (1.0.4)
+    sass (3.4.23)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  jekyll (= 3.4.3)
+  jekyll-feed (~> 0.6)
+  minima (~> 2.0)
+  tzinfo-data
+
+RUBY VERSION
+   ruby 2.4.0p0
+
+BUNDLED WITH
+   1.14.6

_config.yml

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+# Welcome to Jekyll!
+#
+# This config file is meant for settings that affect your whole blog, values
+# which you are expected to set up once and rarely edit after that. If you find
+# yourself editing this file very often, consider using Jekyll's data files
+# feature for the data you need to update frequently.
+#
+# For technical reasons, this file is *NOT* reloaded automatically when you use
+# 'bundle exec jekyll serve'. If you change this file, please restart the server process.
+
+# Site settings
+# These are used to personalize your new site. If you look in the HTML files,
+# you will see them accessed via {{ site.title }}, {{ site.email }}, and so on.
+# You can create any custom variable you would like, and they will be accessible
+# in the templates via {{ site.myvariable }}.
+title: Your awesome title
+email: [email protected]
+description: > # this means to ignore newlines until "baseurl:"
+  Write an awesome description for your new site here. You can edit this
+  line in _config.yml. It will appear in your document head meta (for
+  Google search results) and in your feed.xml site description.
+baseurl: "" # the subpath of your site, e.g. /blog
+url: "" # the base hostname & protocol for your site, e.g. http://example.com
+
+# Build settings
+markdown: kramdown
+gems:
+  - jekyll-feed
+exclude:
+  - Gemfile
+  - Gemfile.lock

_includes/footer.html

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+<div>
+    <p>
+        I am Erik Wiffin.
+        You can contact me at:
+        <a href="http://erik.wiffin.com">erik.wiffin.com</a>
+        or
+        <a href="mailto:[email protected]">[email protected]</a>.
+    </p>
+  <p>
+    This project is on <a href="https://github.com/erikwiffin/0.30000000000000004">github</a>.
+    If you think this page could be improved, send me a pull request.
+  </p>
+</div>
+
+<!-- Google Analytics -->
+<script type="text/javascript">
+
+  var _gaq = _gaq || [];
+  _gaq.push(['_setAccount', 'UA-8267311-11']);
+  _gaq.push(['_trackPageview']);
+
+  (function() {
+    var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
+    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
+    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
+  })();
+
+</script>

_includes/head.html

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+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+
+    <title>{% if page.title %}{{ page.title }}{% else %}{{ site.name }}{% endif %}</title>
+
+    <link rel="canonical" href="{{ site.url}}{{ site.baseurl }}" />
+
+    <!-- CSS -->
+    <link rel="stylesheet" href="{{ site.baseurl }}/styles.css" type="text/css">
+
+</head>

_layouts/default.html

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+<!DOCTYPE html>
+<html lang="en">
+    {% include head.html %}
+    <body>
+        {{ content }}
+
+        {% include footer.html %}
+    </body>
+</html>

_layouts/home.html

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+---
+layout: default
+---
+<div>
+    <h1>Floating Point Math</h1>
+    <p>
+        Your language isn't broken, it's doing floating point math.
+        Computers can only natively store integers,
+        so they need some way of representing decimal numbers.
+        This representation comes with some degree of inaccuracy.
+        That's why, more often than not, <code>.1 + .2 != .3</code>.
+    </p>
+
+    <h3>Why does this happen?</h3>
+    <p>
+        It's actually pretty simple. When you have a base 10 system (like ours),
+        it can only express fractions that use a prime factor of the base.
+        The prime factors of 10 are 2 and 5. So 1/2, 1/4, 1/5, 1/8, and 1/10
+        can all be expressed cleanly because the denominators all use prime factors of 10.
+        In contrast, 1/3, 1/6, and 1/7 are all repeating decimals because their denominators use a prime factor of 3 or 7.
+        In binary (or base 2), the only prime factor is 2. So you can only express fractions cleanly which only contain 2 as a prime factor.
+        In binary, 1/2, 1/4, 1/8 would all be expressed cleanly as decimals.
+        While, 1/5 or 1/10 would be repeating decimals.
+        So 0.1 and 0.2 (1/10 and 1/5) while clean decimals in a base 10 system, are repeating decimals in the base 2 system the computer is operating in.
+        When you do math on these repeating decimals, you end up with leftovers which carry
+        over when you convert the computer's base 2 (binary) number into a more human readable base 10 number.
+    </p>
+
+    <p>
+        Below are some examples of sending <code>.1 + .2</code>
+        to standard output in a variety of languages.
+    </p>
+    <p align="center">
+        read more:
+        |
+        <a href="http://en.wikipedia.org/wiki/Floating_point">wikipedia</a>
+        |
+        <a href="http://grouper.ieee.org/groups/754/">IEEE 754</a>
+        |
+        <a href="http://stackoverflow.com/questions/588004/is-javascripts-math-broken/588014">Stack Overflow</a>
+    </p>
+</div>
+
+<table cellpadding="0" cellspacing="5">
+    <tr>
+        <th>Language</th>
+        <th>Code</th>
+        <th>Result</th>
+    </tr>
+    {% for post in site.posts reversed %}
+    <tr>
+        <td>{{ post.title }}</td>
+        <td>
+            {% if post.code.first %}
+                {% for code in post.code %}
+                    <pre><code>{{ code | xml_escape }}</code></pre>
+                {% if forloop.last %}{% else %}And{% endif %}
+                {% endfor %}
+            {% else %}
+                <pre><code>{{ post.code | xml_escape }}</code></pre>
+            {% endif %}
+        </td>
+        <td>
+            {% if post.result.first %}
+                {% for result in post.result %}
+                    {{ result | markdownify }}
+                    {% if forloop.last %}{% else %}And{% endif %}
+                {% endfor %}
+            {% else %}
+                {{ post.result | markdownify }}
+            {% endif %}
+        </td>
+    </tr>
+    {% if post.excerpt.size > 1 %}
+    <tr>
+        <td colspan="3" class="comment">{{ post.excerpt }}</td>
+    </tr>
+    {% endif %}
+    {% endfor %}
+</table>

_layouts/page.html

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+---
+layout: default
+---
+<header>
+    <div class="header-small">
+        <a href="{{ site.url }}{{ site.baseurl }}">{{ site.name }}</a>
+    </div>
+</header>
+<div class="page">
+    <div class="page-title">{{ page.title }}</div>
+    {{ content }}
+</div>

_layouts/post.html

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+---
+layout: default
+---
+<header>
+    <div class="header-small">
+        <a href="{{ site.url }}{{ site.baseurl }}">{{ site.name }}</a>
+    </div>
+</header>
+<div class="post">
+    {{ content }}
+</div>

_posts/2017-04-30-abap.md

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+---
+layout: post
+title: "ABAP"
+code:
+  - WRITE / CONV f( '.1' + '.2' ).
+  - WRITE / CONV decfloat16( '.1' + '.2' ).
+result:
+  - 3.0000000000000004E-01  
+  - 0.3
+---

_posts/2017-04-30-bc.md

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+---
+layout: post
+title: "bc"
+code: 0.1 + 0.2
+result: 0.3
+---

_posts/2017-04-30-c.md

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+---
+layout: post
+title:  "C"
+code: |-
+    #include<stdio.h>
+    int main(int argc, char** argv) {
+        printf("%.17f\n", .1+.2);
+        return 0;
+    }
+result: 0.30000000000000004
+---

_posts/2017-04-30-clojure.md

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+---
+layout: post
+title: "Clojure"
+code: "(+ 0.1 0.2)"
+result: "0.30000000000000004"
+---
+Clojure supports arbitrary precision and ratios. <code>(+ 0.1M 0.2M)</code> returns <code>0.3M</code>, while <code>(+ 1/10 2/10)</code> returns <code>3/10</code>.

_posts/2017-04-30-common-lisp.md

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+---
+layout: post
+title: "Common Lisp"
+code:
+  - '* (+ .1 .2)'
+  - '* (+ 1/10 2/10)'
+result:
+  - 0.3
+  - 3/10
+---

_posts/2017-04-30-cpp.md

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+---
+layout: post
+title: "C++"
+code: |-
+    #include <iomanip>
+    std::cout << setprecision(17) << 0.1 + 0.2
+result: 0.30000000000000004
+---

_posts/2017-04-30-csharp.md

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+---
+layout: post
+title: "C#"
+code: 'Console.WriteLine("{0:R}", .1 + .2);'
+result: "0.30000000000000004"
+---

_posts/2017-04-30-d.md

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+---
+layout: post
+title: "D"
+code: |-
+  import std.stdio;
+
+  void main(string[] args) {
+    writefln("%.17f", .1+.2);
+    writefln("%.17f", .1f+.2f);
+    writefln("%.17f", .1L+.2L);
+  }
+result: |-
+  0.29999999999999999  
+  0.30000001192092896  
+  0.30000000000000000
+---

_posts/2017-04-30-dc.md

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+---
+layout: post
+title: "dc"
+code: "0.1 0.2 + p"
+result: ".3"
+---

_posts/2017-04-30-delphi-xe5.md

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+---
+layout: post
+title: "Delphi XE5"
+code: "writeln(0.1 + 0.2);"
+result: "3.00000000000000E-0001"
+---

_posts/2017-04-30-elixir.md

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+---
+layout: post
+title: "Elixir"
+code: "IO.puts(0.1 + 0.2)"
+result: "0.30000000000000004"
+---