Floating Point Visually Explained. August 29th, 2017 In the early 90s, to write a 3D game engine for PCs largely meant to repurpose the machine. PCs of this era were built to run word processors and spreadsheets, not perform 3D calculations at 70 frames per second. A significant obstacle was the CPU which despite being powerful did not have an hardware floating point unit. Programmers only had an ALU available to crunch integers.
As I was writing Game Engine Black Book: Wolfenstein 3D I wanted to vividly demonstrate how much of a handicap it was to work without floating points. I ended up with what follows and I decided to include it in the book. How Floating Point are usually explained As David Goldbert wrote: Floating-point arithmetic is considered an esoteric subject by many people. I could not agree more with him. Floating Point internals. The three sections of a floating Point number. So far, so good. How everybody hates floating point to be explained to them. This is usually where I flip the table. 3.14 window and offset. Execute Python Online. Python Cloud IDE | Python Fiddle.
Labs. Perl Tutorial. Perl is a programming language developed by Larry Wall, especially designed for text processing. Though Perl is not officially an acronym but many times it is used as it stands for Practical Extraction and Report Language. It runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial provides a complete understanding on Perl. This reference has been prepared for beginners to help them understand the basic to advanced concepts related to Perl Scripting languages. Before you start practicing with various types of examples given in this reference, we are making an assumption that you have prior exposure to C programming and Unix Shell. For most of the examples given in this tutorial you will find Try it option, so just make use of this option to execute your Perl programs at the spot and enjoy your learning. Try following example using Try it option available at the top right corner of the below sample code box −
About ShellCheck. This page has been deprecated! Please see github.com/koalaman/shellcheck for updated information! ShellCheck is a static analysis and linting tool for sh/bash scripts. It's mainly focused on handling typical beginner and intermediate level syntax errors and pitfalls where the shell just gives a cryptic error message or strange behavior, but it also reports on a few more advanced issues where corner cases can cause delayed failures. Haskell source code is available on GitHub! Try ShellCheck online Go to ShellCheck.net to copy-paste a shell script and get immediate, automatic feedback. Tell your friends! The online version is always synced against the latest git commit. Install ShellCheck locally ShellCheck is available through your package manager! Run ShellCheck in your editor If you install both shellcheck and either Syntastic for Vim or Flycheck for Emacs, you'll get feedback straight in your editor!
What does ShellCheck check? Unquoted globs for find/grep find . Constant test expressions [[ n ! Orion - Open Source Web and Cloud Development Environment. PHP IDE :: JetBrains PhpStorm. Tutorials. CodeCombat - Learn how to code by playing a game. Working with Dialog Controls in LibreOffice Calc using Macro – Part 1. This tutorial will cover on how to create a basic LibreOffice Dialog and adding various controls such as TextBox.
Also it covers on how to read the control values using Calc Macros. Adding a Dialog To add a Dialog in LibreOffice Calc, select from menu: Tools -> Macros -> Organize Dialogs… Create Dialog from Menu Once above options is chosen, below LO Basic Macro Organizer would open. Create a New Dialog On the New Dialog pop-up , give a name to your dialog. New Dialog You can see the Dialog1 is come up under My Dialogs -> Standard -> Dialog1.
Adding a TextBox Control On the same LO Basic Macro Organizer, click EDIT while Dialog1 is selected. Edit Dialog Entire Dialog editor would open inside LO Calc. The controls are placed at the bottom of the screen. The Dialog should look like this now. The Dialog To set the properties of each controls, click/select the control, then you can see the properties window opened on the bottom-left side of the editor. Dialog with Properties The Macro Run Video Related. Sourcegraph. Execute Perl Script Online. Comparison of programming paradigms. This article attempts to set out the various similarities and differences between the various programming paradigms as a summary in both graphical and tabular format with links to the separate discussions concerning these similarities and differences in extant Wikipedia articles.
Main paradigm approaches The following are considered[by whom?] The main programming paradigms. There is inevitably some overlap in these paradigms but the main features or identifiable differences are summarized in the following table: Differences in terminology Language support Some programmers feel that these features are unimportant or even frivolous.
Code Maven saves what lesson you are on, so feel free to stop at any time and come back later. Have fun! Frequently Asked Questions What is the c in things like c.save()? C is a variable Code Maven creates for you that contains the Canvas' 2D context. Var c = document.getElementById('pane').getContext('2d'); Is there any other code that is hidden from me? Software design pattern. In software engineering, a software design pattern is a general, reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations.
Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system. Design patterns may be viewed as a structured approach to computer programming intermediate between the levels of a programming paradigm and a concrete algorithm. History Although design patterns have been applied practically for a long time, formalization of the concept of design patterns languished for several years. Practice By definition, a pattern must be programmed anew into each application that uses it.
Software design techniques are difficult to apply to a broader range of problems. Design Patterns. It has been highly influential to the field of software engineering and is regarded as an important source for object-oriented design theory and practice. More than 500,000 copies have been sold in English and in 13 other languages.
The authors are often referred to as the Gang of Four (GoF). History Introduction, Chapter 1 Chapter 1 is a discussion of object-oriented design techniques, based on the authors' experience, which they believe would lead to good object-oriented software design, including: clients remain unaware of the specific types of objects they use, as long as the object adheres to the interfaceclients remain unaware of the classes that implement these objects; clients only know about the abstract class(es) defining the interface Use of an interface also leads to dynamic binding and polymorphism, which are central features of object-oriented programming. The authors admit that delegation and parameterization are very powerful but add a warning: Formatting Code & Conquer. Most Important: Have Fun. And earn some badges. See how your strategy works out in different scenarios, challenge other players, receive points, earn badges and climb your way to the top of the leaderboard.
Boost your coding skills. Do it playing. This game provides the perfect setting to introduce the key concepts employers ask you to know. Comparison of programming paradigms. This article attempts to set out the various similarities and differences between the various programming paradigms as a summary in both graphical and tabular format with links to the separate discussions concerning these similarities and differences in extant Wikipedia articles. Main paradigm approaches The following are considered[by whom?] The main programming paradigms. There is inevitably some overlap in these paradigms but the main features or identifiable differences are summarized in the following table: Differences in terminology Language support Some programmers feel that these features are unimportant or even frivolous.
An extension of this is the syntactic saccharin, or gratuitous syntax that does not make programming easier. Performance comparison Purely in terms of total instruction path length, a program coded in an imperative style, without using any subroutines at all, would have the lowest count. Managed code Serialization of objects Toward a better programming. This post is based on my talk, "Finding a way out", from Strange Loop 2013 When I built the original prototype of Light Table I didn't have any grand purpose or goal in mind. I simply had some ideas on how programming could be better and I wanted to see how hard they would be to build. Until fairly recently, it never dawned on me that I've actually spent the past decade trying out ideas on how programming could be better, from web frameworks, to Visual Studio, to Light Table and its future. And it wasn't until I had that realization that I also came to the conclusion that I'd been going about this all wrong.
As a matter of fact, I made a classic rookie mistake: I set out to answer a question I didn't understand. How do we make programming better? I kept asking myself "How can we make programming better? " To answer that I needed more data, not just from my time behind one way mirrors or my own experiences, but from the "real world". What is programming? And what's wrong with it? Perl Tutorial Course | Windows | Mike Gossland.
Introductory Perl Tutorial Course for Windows This introductory Perl tutorial course for Windows will introduce you to the beginning concepts of Perl in a familiar Windows environment and show you how to set it up for CGI with a web server running on your own box. I wrote this course as an accompaniment to a classroom course in Perl, but now this website is visited by Perl students from around the world. In addition to the basic Perl content, an appendix contains instructions on installing Perl and suggestions for a couple of web servers to run on your Windows PC. If you are following this course on your own, please follow it in sequence. The ideas are presented carefully so that each section builds on the sections before. Please email me at firstname.lastname@example.org if you have comments or questions about the content. Course Prerequisites A student should be familiar with basic operation of a computer, how to open a DOS session, how to download and install a software package.
On the other hand, Sedsed. Lesson 6 - Tuples, Lists, and Dictionaries. Introduction Your brain still hurting from the last lesson? Never worry, this one will require a little less thought. We're going back to something simple - variables - but a little more in depth. Think about it - variables store one bit of information. They may regurgitate (just not on the carpet...) that information at any point, and their bit of information can be changed at any time. Variables are great at what they do - storing a piece of information that may change over time. But what if you need to store a long list of information, which doesn't change over time? The Solution - Lists, Tuples, and Dictionaries For these three problems, Python uses three different solutions - Tuples, lists, and dictionaries: Lists are what they seem - a list of values.
Tuples Tuples are pretty easy to make. Code Example 1 - creating a tuple months = ('January','February','March','April','May','June',\ 'July','August','September','October','November',' December') Table 1 - tuple indicies Lists Dictionaries. Comparison of programming paradigms. Welcome - Learn Python - Free Interactive Python Tutorial. Looping the loop. In the last exercise we printed out part of the 12 times table.
But it took a lot of typing and if we needed to extend it, it would be very time consuming. Fortunately there is a better way and it's where we start to see the real power that programming languages offer us. FOR Loops What we are going to do is get the programming language to do the repetition, substituting a variable which increases in value each time it repeats. In Python it looks like this: >>>for i in range(1,13): ... print "%d x 12 = %d" % (i, i*12) ... Note 1: We need the range(1,13) to specify 13 because range() generates from the first number up to, but not including, the second number. Note 2: The for operator in Python is actually a foreach operator in that it applies the subsequent code sequence to each member of a collection. Note 3: The print line is indented or spaced further in than the for line above it. Note 4: In the interactive interpreter you need to hit return twice to get the program to run. WHILE Loops. CodingBat.
In Python, when to use a Dictionary, List or Set? Rosetta Code. Python Overview. Bash Hackers Wiki Frontpage. Examples of small bash programs. Linux Shell Scripting Tutorial - A Beginner's handbook. Tutorials. Open Vim. Awk - A Tutorial and Introduction - by Bruce Barnett.
Python Cloud IDE | Python Fiddle. Tech Stuff - Regular Expressions - A Gentle User Guide and Tutorial. Bash Guide for Beginners. The Linux Documentation Project. Awk - A Tutorial and Introduction - by Bruce Barnett.