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  • Programming bots in games

    - by Bane
    I'm interested in how bots are usually written. Here's my situation: I plan to make an online 2D mecha game in HTML5, and the server-side will be done with node. It is intended to be multiplayer, but I also want to make bots in case there aren't enough players. How does my game logic see them, as players or as bots? Is there a standard by which I should make them? Also, any general tips and hints will be OK.

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  • Structure vs. programming

    - by ChristopherW
    Is it bad that I often find myself spending more time on program structure than actually writing code inside methods? Is this common? I feel I spend more time laying the foundation than actually building the house (metaphorically). While I understand that without a good foundation the house will cave in, but does it legitimately need to take half of the project to finalize code structure? I understand design patterns, and I know where to go if I need help on choosing one, but often I find myself doubting my own choices.

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  • General List of Common Programming Errors

    - by javamonkey79
    As one journey's from apprentice to journeyman to master I've noticed that one accumulates a list of best practices for things they've been bitten by. Personally, I write most of my stuff in java & SQL so my list tends to be slated towards them. I've accumulated the following: When doing list removal, always reverse iterate Avoid adding items to a list you are currently iterating on Watch out for NullPointerExceptions Now, I know there are language specific "common errors" links out there like this one. And I'm also aware of the pragmatic programmer tips, Martin Fowler's "code smells". Does anyone know of any good lists out there of things like I've listed above (re: list removal, adding items, etc). My guess is that there are some good QA folks out there that can probably throw me a bone here. I'm not looking for things the compiler can catch - I'm looking for common things that cause bugs. In the event that there isn't a list out there already then I welcome posting your own findings here. Thanks in advance!

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  • how to really master a programming language

    - by cprogcr
    I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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  • Why are there different programming languages [closed]

    - by Velizar Hristov
    I'm not asking about the usefulness of the languages that do exist already: I already know, and agree, that different languages are better for different purposes. However, why don't they just have a single language that can do it all? Why, when C# was created, they didn't keep everything from C and C++ and just add a few things, so that it can be used as both a low-level and high-level language? I see no harm in adding all kinds of commands to a single language that would allow it to be good for everything, and even eliminate the need for all other languages. Someone from another thread said that if there's a flaw in a certain language, its successor might not have it. However, why don't we just update that language to remove the flaw, and/or add anything that's missing? Arrays are different in Java and C#, but why not have them both, just use different commands for them? And so on...

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  • Event Driven Programming 101

    - by JHarley1
    Good Morning, I previously asked the Q. of how Event Handlers Work (which I got a great answer for). I would now like to understand the basics of how are events are associated with on-screen objects? An explanation of how Events are associated with on Screen Objects: The application registers the Event, the Event Handler and the Component with the GUI Server. When an Event is detected the GUI Server has to link an Event to a Window and then to a Component, it then consults the Event / Component Table to identify which Handler (s) to be executed. I am having problems finding resources/papers that have mention of this process - especially of a Event / Component Table - can anyone clarify?

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  • Question on methods in Object Oriented Programming

    - by mal
    I’m learning Java at the minute (first language), and as a project I’m looking at developing a simple puzzle game. My question relates to the methods within a class. I have my Block type class; it has its many attributes, set methods, get methods and just plain methods. There are quite a few. Then I have my main board class. At the moment it does most of the logic, positioning of sprites collision detection and then draws the sprites etc... As I am learning to program as much as I’m learning to program games I’m curious to know how much code is typically acceptable within a given method. Is there such thing as having too many methods? All my draw functionality happens in one method, should I break this into a few ‘sub’ methods? My thinking is if I find at a later stage that the for loop I’m using to cycle through the array of sprites searching for collisions in the spriteCollision() method is inefficient I code a new method and just replace the old method calls with the new one, leaving the old code intact. Is it bad practice to have a method that contains one if statement, and place the call for that method in the for loop? I’m very much in the early stages of coding/designing and I need all the help I can get! I find it a little intimidating when people are talking about throwing together a prototype in a day too! Can’t wait until I’m that good!

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  • Which ebook format is better to read programming books on ipad [closed]

    - by user1713836
    I tried reading the pdf books on ipad but i don't feel cpmfortable after reading 40 odd pages. don't know why. I just want to know is there any other format which can sooth the eys and behave exactly like hard books. Any other ebooks reader which is better than ipad. But iwant the color display of code syntax as well I am fed up of printing the pdfs as every few months we have new documentation of new version of softwares

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  • Functional Programming, JavaScript and UI - some neophyte questions

    - by jamesson
    This has been discussed in other threads, however I am hoping for some comments relevant to UI and an explanation of some vitriol I had flung my way in a Certain IRC Channel Which shall remain nameless. In the discussion here, the comments in the accepted answer suggest that I approach the given code from a functional perspective, which was new to me at the time. Wikipedia said, among other things, that FP "avoids state and mutable data", which includes according to the discussion global vars. Now, being that I am already pretty far along in my project I am not going to learn FP before I finish, but... How is it possible to avoid global vars if, for instance, I have a UI whose entire functionality changes if a mousebutton is down? I have a number of things like this. Why was there a strong negative reaction in the Certain IRC channel to implementing FP in JS? When I Brought up what seemed to me to be supportive comments by Crockford, people got even madder. Now, this being IRC there is no rep system, but they at least gave indication of having read TGP (which I haven't gotten to yet) so I'm assuming they're not idiots. Many thanks in advance Joe

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  • How can I really master a programming language?

    - by cprogcr
    I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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  • A completely free and open programming language

    - by XGouchet
    With Oracle vs Google trial, it seems that Java is not entirely Open and free (as free software) as I expected. Although there exists completely free/open JVM, it's hard to know what is a copyright infringement with Java, and what is not. So I'd like to know if there is a completely Open and free language with open and free IDE (Eclipse-like) out there, Object Oriented if possible, and able to make window-based applications for the main OSs (Linux, Mac, Windows).

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  • New to Java Programming - Error help

    - by JJJ
    I am going through a Java book and drafting the examples and have run into the following error when compiling this code. Any help would be appreciated thank you. Error: Main.java:3: class Addition is public, should be declared in a file named Addition.java public class Addition        ^ 1 error Code: import java.io.*; import java.util.Scanner; public class Addition {   public static void main(String[] args) { java.util.Scanner input = new java.util.Scanner(System.in);  int number1; int number2; int sum; System.out.print( "Enter first digit: " ); number1 = input.nextInt(); System.out.print( "Enter second digit:" ); number2 = input.nextInt(); sum = number1 + number2; System.out.printf( "Sum is %d\n, sum" );      } }

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  • Why use other number bases when programming

    - by JMD
    My coworkers and I have been bending our minds to figuring out why anyone would go out of their way to program numbers in a base other than base 10. I suggested that perhaps you could optimize longer equations by putting the variables in the correct base you are working with (for instance, if you have only sets of 5 of something with no remainders you could use base 5), but I'm not sure if that's true. Any thoughts?

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  • Why do programming language (open) standards cost money?

    - by fish
    Isn't it counter-productive to ask for 384 Swiss franks for C11 or 352 Swiss franks for C++11, if the aim is to make the standards widely adopted? Please note, I'm not ranting at all, and I'm not against paying; I would like to understand the rationale behind setting the prices as such, especially knowing that ISO is network of national standard institutes (i.e. funded by governments). And I also doubt that these prices would generate enough income to fund an organization like that, so there must be another reason.

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  • Programming in R help

    - by mary
    I needed help in converting the temperature from Farenheit to Celsius. Below are several attempts and each of these fails. I have ran the following below and need help in saying what error message is created by: a) (temp -32) Can you please let me know the error message in a comment, and what it means and how to directly relate the wording of the error message with the problem you find in the expression. likewise for: b) (temp - 32)5/9 don't know the erorr on this one c) 5/9(temp - 32) need an asterisk, but not specific enough d) [temp - 32]5/9 I know braces is off.

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  • Choosing a new programming language to learn [on hold]

    - by Xelom
    I'm a Microsoft Stack(ASP.NET, C#) developer. Mainly, I develop server side software, windows services, restful apis etc. My client side interaction is really really low. So aside from C# I want to learn a new language. Time is precious and I want to give my focus to a language which have a future. My language list is: Scala (Powerful usage in Twitter) Go (Getting popular and channels are pretty awesome) Erlang (Stable server side programs. Used at Whatsapp) You can give advice for the above or you can give me a better option. My only exception is Objective-C. I don't want to get in that one. Thanks

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  • Stats on programming languages usage

    - by sameold
    I'm doing some research for a project and I'm trying to find out what are the 5 most-used server-side languages. I found this chart (http://i.stack.imgur.com/vPXgR.jpg) on css-tricks.com (produced from a poll the site owner ran), but in the comments, some suggested that the poll may be skewed in favor of php because most of the site visitors are designers. I'm not sure if this chart looks realistic. Does anyone know of similar stats?

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  • Simple end-to-end load and bottleneck monitoring for DB-based web sites

    - by T.J. Crowder
    What tools do you use / would you recommend for monitoring a Linux-based, DB-based website's servers for bottlenecks and load? The obvious goal being to know when growth has gotten to the point where it's necessary to scale up (or out) one or more of the bits and pieces because the current system won't be managing the load if an observed trend continues. I'm looking for general recommendations based on standard Linux load metrics, disk I/O metrics, network I/O metrics, etc., but if specifics are helpful: It'll be Tomcat6 using APR (possibly with a Varnish or similar caching and balancing front-end), MySQL, and either Ubuntu 8.04 LTS or 10.04 LTS depending on timing. I know about top, vmstat, iostat, bwmon and the like that collect and parse info from the /proc file system (et. al.); and obviously MySQL provides a lot of queriable performance information. I could use those directly, probably automating periodic monitoring logs with scripts and such. But I have a suspicion that I'd be reinventing a wheel... For example, Hyperic HQ seems to be along the lines of what I'm looking for. Others? Meta: I tend to think of "recommendation" questions as needing to be CW because there's no one right answer, but I see a lot of these here that aren't CWs, so I haven't marked it as one. I'll happily do so if enough people think I should.

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  • Best way to let users choose country/language when submiting an URL to a directory

    - by Claudiu
    Hi all, I want to offer the user the possibility to add the country/language for websites they would submit to a fairly simple website directory. I have a folder with flags from http://www.famfamfam.com/lab/icons/flags/ . The flag images are named according to the ISO 3166-1 alpha-2 country codes, meaning that I could make a PHP script that would be able to retrieve images and the name of the country retrieved from the image name (not the full name, but it wouldn't be necessary). Just to make things clearer, I couldn't find a proper combo-box jQuery plugin for my needs (that would act exactly like the native but with an icon before the text) and don't really have the time to develop one on my own. Considering the number of images, I also wouldn't just display them all with a radio box near them. Also, having a classic drop-down list would be a nightmare for me as I would have to assign the short country name manually to each entry, or do it once for every country. Offering the user a dropdown list with the short country names but no flag near them would also be unfriendly and confusing. The idea is that every website featured in the directory would have the country flag icon near it. I have the images named properly but I don't know how to let the user choose the right image for their website. Any idees? Thank you all in advance! EDIT Temporary solution is this file: http://www.andrewpatton.com/countrylist.csv It contains a list of countries including various other info, like the short country name, the same name that's used for the flag images. I can take that information and have a classic like this: <select name="countries"> <option value="ro">Romania</option> <option value="ie">Ireland</option> <!-- and so on --> </select> Still, If anybody has a better idea...

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  • Best way to let users choose country/language when submiting an URL to a directory

    - by Claudiu
    I want to offer the user the possibility to add the country/language for websites they would submit to a fairly simple website directory. I have a folder with flags from http://www.famfamfam.com/lab/icons/flags/ . The flag images are named according to the ISO 3166-1 alpha-2 country codes, meaning that I could make a PHP script that would be able to retrieve images and the name of the country retrieved from the image name (not the full name, but it wouldn't be necessary). Just to make things clearer, I couldn't find a proper combo-box jQuery plugin for my needs (that would act exactly like the native but with an icon before the text) and don't really have the time to develop one on my own. Considering the number of images, I also wouldn't just display them all with a radio box near them. Also, having a classic drop-down list would be a nightmare for me as I would have to assign the short country name manually to each entry, or do it once for every country. Offering the user a dropdown list with the short country names but no flag near them would also be unfriendly and confusing. The idea is that every website featured in the directory would have the country flag icon near it. I have the images named properly but I don't know how to let the user choose the right image for their website. Any idees? Thank you all in advance! EDIT Temporary solution is this file: http://www.andrewpatton.com/countrylist.csv It contains a list of countries including various other info, like the short country name, the same name that's used for the flag images. I can take that information and have a classic like this: <select name="countries"> <option value="ro">Romania</option> <option value="ie">Ireland</option> <!-- and so on --> </select> Still, If anybody has a better idea...

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  • caches domain user on local PC

    - by user630320
    We have a fully working domain in UK and around the world we have user who use VPN ( checkpoint) to connect to or domain. One of the user in USA has a laptop which he never logged on to before ( it does caches the user login details). Does anyone know how to cache user login information on this laptop. I have tried netdom trust to add this user to the laptop but i was not able to do this. At the moment user is logging in with a local administrator account and then using VPN to log on to our domain but when it comes to accessing files on domain user get access deieded. When user try to login it gets There are currently no log on servers available to service the logon request Does anyone know how to add user.

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  • Is aspect oriented programming a misnomer?

    - by glenviewjeff
    From everything I have learned about "Aspect Oriented Programming" or "Aspect Oriented Software Development," labeling it as a programming paradigm or methodology appears to be inaccurate. From what I can tell it is not a fundamental technique for programming. To nail down what is meant by "paradigm" and "methodology," please refer to the following definitions from the American Heritage Dictionary. Compare how well or poorly "Object-Oriented Programming" applies to each vs. how well AOP fits. Paradigm: A set of assumptions, concepts, values, and practices that constitutes a way of viewing reality for the community that shares them, especially in an intellectual discipline. Methodology: A body of practices, procedures, and rules used by those who work in a discipline or engage in an inquiry; a set of working methods. "Evidence-based medicine" satisfies the definition of paradigm, but "hysterectomy-based medicine" would be a misnomer because the problem space is too narrow. I am getting the impression that AOP may be misnamed because based on the "oriented-programming" suffix, AOP is alleging to be both a paradigm and a methodology in the same way "Object-Oriented Programming" is. Both of these terms (paradigm and methodology) indicate a fundamental technique, where what I understand about aspects is a technology for solving a narrow problem scope, maybe comparable in magnitude to the static variable feature of Java. If it's true that aspects solve a narrow set of problems, and AOP isn't a misnomer, then why shouldn't all programming techniques be given the "oriented-programming" suffix, such as "inheritance-oriented programming," "dependency-oriented programming," or "scope-oriented programming?"

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  • Oracle Fusion Procurement Designed for User Productivity

    - by Applications User Experience
    Sean Rice, Manager, Applications User Experience Oracle Fusion Procurement Design Goals In Oracle Fusion Procurement, we set out to create a streamlined user experience based on the way users do their jobs. Oracle has spent hundreds of hours with customers to get to the heart of what users need to do their jobs. By designing a procurement application around user needs, Oracle has crafted a user experience that puts the tools that people need at their fingertips. In Oracle Fusion Procurement, the user experience is designed to provide the user with information that will drive navigation rather than requiring the user to find information. One of our design goals for Oracle Fusion Procurement was to reduce the number of screens and clicks that a user must go through to complete frequently performed tasks. The requisition process in Oracle Fusion Procurement (Figure 1) illustrates how we have streamlined workflows. Oracle Fusion Self-Service Procurement brings together billing metrics, descriptions of the order, justification for the order, a breakdown of the components of the order, and the amount—all in one place. Previous generations of procurement software required the user to navigate to several different pages to gather all of this information. With Oracle Fusion, everything is presented on one page. The result is that users can complete their tasks in less time. The focus is on completing the work, not finding the work. Figure 1. Creating a requisition in Oracle Fusion Self-Service Procurement is a consumer-like shopping experience. Will Oracle Fusion Procurement Increase Productivity? To answer this question, Oracle sought to model how two experts working head to head—one in an existing enterprise application and another in Oracle Fusion Procurement—would perform the same task. We compared Oracle Fusion designs to corresponding existing applications using the keystroke-level modeling (KLM) method. This method is based on years of research at universities such as Carnegie Mellon and research labs like Xerox Palo Alto Research Center. The KLM method breaks tasks into a sequence of operations and uses standardized models to evaluate all of the physical and cognitive actions that a person must take to complete a task: what a user would have to click, how long each click would take (not only the physical action of the click or typing of a letter, but also how long someone would have to think about the page when taking the action), and user interface changes that result from the click. By applying standard time estimates for all of the operators in the task, an estimate of the overall task time is calculated. Task times from the model enable researchers to predict end-user productivity. For the study, we focused on modeling procurement business process task flows that were considered business or mission critical: high-frequency tasks and high-value tasks. The designs evaluated encompassed tasks that are currently performed by employees, professional buyers, suppliers, and sourcing professionals in advanced procurement applications. For each of these flows, we created detailed task scenarios that provided the context for each task, conducted task walk-throughs in both the Oracle Fusion design and the existing application, analyzed and documented the steps and actions required to complete each task, and applied standard time estimates to the operators in each task to estimate overall task completion times. The Results The KLM method predicted that the Oracle Fusion Procurement designs would result in productivity gains in each task, ranging from 13 percent to 38 percent, with an overall productivity gain of 22.5 percent. These performance gains can be attributed to a reduction in the number of clicks and screens needed to complete the tasks. For example, creating a requisition in Oracle Fusion Procurement takes a user through only two screens, while ordering the same item in a previous version requires six screens to complete the task. Modeling user productivity has resulted not only in advances in Oracle Fusion applications, but also in advances in other areas. We leveraged lessons learned from the KLM studies to establish products like Oracle E-Business Suite (EBS). New user experience features in EBS 12.1.3, such as navigational improvements to the main menu, a Google-type search using auto-suggest, embedded analytics, and an in-context list of values tool help to reduce clicks and improve efficiency. For more information about KLM, refer to the Measuring User Productivity blog.

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