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Pointers, arrays, and string literals
A recently posted question on Stack Overflow highlighted a common misconception about the role of pointers and arrays held by many programmers learning C.The confusion stems from a misunderstanding concerning the role of pointers and strings in C. A pointer is an address in memory. It often points to an index in an array, such as in the function strtoupper in the following code:void strtoupper(char *str) { if (str) { // null ptr check, courtesy of Michael while (...
char pointer,initialization,literal,cann 2011-09-22 13:29:23
If a programming language was a boat…
我是å—最近的一个论å›å¸–åå¯å‘,他的想法至今ä»è®©æˆ‘感到奇特。Turing(图çµ)Turingç»å¯¹æ˜¯ä¸€ä¸ªåŒäººçš®åˆ’艇(感谢评论里的æ醒)。它很å°ã€‚人力的。它通常被当作åˆå¦è€…çš„â€èˆ¹â€œã€‚è€...
Programming,Turing,C,C# 2011-06-24 01:07:42
20 bit operations programmers should know
While talking about bit operation, programmers usually think about its efficiency. In embedded programming and system core optimization, appropriate use of bit operations is always a fascinating. When finding a job, it will help you a lot if you use bit operations when writing codes. Mastering simple bit arithmetic skills is necessary. 1. Get maximum int value int getMaxInt(){ return (1 << 31) - 1;//...
Bit operation, Tips 2012-12-19 12:53:33
HTML5 Web Worker
Web Worker is a JavaScript multithreading solution provided by HTML5. we can put some compute intensive codes into Web Worker and it will not hang the user interface. 1. How to use Web Worker Web Worker's basic mechanism is to use Worker to load a JavaScript file to create a new thread in JavaScript's main thread. It will not block other thread's execution and will provide a data exchange interface between main thread and new thread : postMessage() and onmessage. Let's look at an example: //work...
JavaScript,HTML,Web Worker 2012-12-02 06:25:00
Set Theory in C++11
Have you ever felt the need to perform set theoretic operations on types? Not really? Me neither, but I thought it’s a fun thing to try out. So, if you ever feel the need of using type sets, C++11 makes it quite easy to do so. Especially variadic templates allow for a much more condensed syntax compared to type list constructs formerly used. (Disclaimer: This is rather a proof of concept, but maybe somebody comes up with a useful scenario.) Let’s start by d...
C++,set theory,Math 2012-03-11 13:15:55
How to find which process a file is being written by in Linux?
Some people ask a file is being written by one process and they want to check this process, but they cannot find the process even with sof. This question is very common and there are many solutions, here we introduce a straightforward method. In Linux, each file will be stored on one device and of course there will be a relative inode, then we can use vfs.write to know who is writing the inode on one specified device continuously. Luckily there is inodewatch.stp in the installation package of s...
Linux,process,file write 2013-03-16 21:44:35
Extending Native Features To HTML5 Web Apps
A small company called AppMobi is enabling developers to create HTML5 apps that tap into native hardware and OS capabilities of mobile devices, such as gravity sensing, accelerometer, GPS, camera, sound and vibration, and the file system, InfoWorld reports. 'Its MobiUs browser for iOS implements HTML5's DirectCanvas API for gaming, as well as the HTML5 local storage API for saving executables and data in the browser cache so that apps can run offline. But what makes MobiUs more than just ye...
HTML,WebApp,Hardware,Local storage,Gravity accelaration,AppMobi 2011-11-07 02:57:08
Lasagna Code
Anyone who claims to be even remotely versed in computer science knows what “spaghetti code†is. That type of code still sadly exists. But today we also have, for lack of a better term — and sticking to the pasta metaphor — “lasagna codeâ€.Lasagna Code is layer upon layer of abstractions, objects and other meaningless misdirections that result in bloated, hard to maintain code all in the name of “clarityâ€. It drives me nuts to see how badly some c...
Lasagna Code,Analysis,spaghetti code 2011-11-16 03:12:03
Removing all child nodes from an element
When manipulating the DOM, it's often useful to remove all child nodes from a specific element. This typically comes in handy when you're looking to replace the content of an element with a separate form element, such as an <input>, so the user can edit the actual value.Here's an example of something I recently created that illustrates my point:Get the Flash Player to see this player.These "dynamic form elements" are written to the page only when the...
Js,DOM,Remove all children,Clear,JavaScript,Code 2011-10-19 10:04:23
Create animated refresh button in Android
In Android, we can have drawings on a button, also we can put animated drawings on a button as well. Today we will show how to create an animated refresh button with an animated spinner on it. We need to create an animated drawing first. Here we name it as progress.xml and put it in the res/drawable folder: <?xml version="1.0" encoding="utf-8"?><animation-list xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/spin_refresh" android:oneshot="fal...
Animation,Spinner,Refresh button,Android 2012-11-02 11:51:41
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