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Converting Decimal Fractions to Binary
Converting Decimal Fractions to Binary In the text proper, we saw how to convert the decimal number 14.75 to a binary representation. In this instance, we \"eyeballed\" the fractional part of the binary expansion; 3/4 is obviously 1/2 + 1/4. While this worked for this particular example, we\'ll need a more systematic approach for less obvious cases. In fact, there is a simple, step-by-step method for computing the binary expansion on the right-hand side of the point. We will illustrate the metho...
Decimal,Fractional,Binary 2011-03-19 06:45:35
A trick of building multithreaded application on Solaris
Firstly, Let’s see a simple multithreaded application: #include <stdio.h> #include <pthread.h> #include <errno.h> void *thread1_func(void *p_arg) { errno = 0; sleep(3); errno = 1; printf("%s exit, errno is %d\n", (char*)p_arg, errno); } void *thread2_func(void *p_arg) { errno = 0; sleep(5); printf("%s exit, errno is %d\n", (char*)p_arg, errno); } int main(void) { pthread_t t1, t2; ...
File upload in PHP
File is a special kind of form data, when being uploaded to the server through HTTP POST request, PHP will create a $_FILES global array, the relevant file information will be stored in this global array. We will illustrate file upload with some code snippets using PHP and look into the internal work mechanism. Lastly will talk about file upload security. File upload In order for users to upload files in client side, we have to provide a form on the user interface. Since the uploaded file is a s...
File upload,PHP 2012-11-30 22:01:28
Skills Needed to be a Web Developer in 2011
Many web developers think they already have all the knowledge they need to continue their careers. Check out this list of the ten skills all web developers must have to succeed in 2011 and beyond, and see how you measure up.1) Speak The Basic Languages of the WebBesides the content mark-up of HTML and the style rich sheets of CSS, how are you at your JavaScript and other advanced DHTML features? HTML 5, the latest upcoming W3C standard, includes audio and video embedding, database connectivity a...
HTML5,Web skills,PHP,.NET,Java 2011-05-12 00:47:49
Automate Everything
Performing manual, repetitive tasks enrages me. I used to think this was a corollary of being a programmer, but I’ve come to suspect (or hope) that this behaviour is inherent in being human. But being able to hack together scripts simply makes it much easier to go from a state of rage to a basic solution in a very small amount of time. As a side point, this is one of the reasons that teaching the basics of programming in schools is so important. It’s hard to think of any j...
Why cannot compare double values directly for equality?
A question in PHP: Get some value from the database and use floatval() to convert it to floatint point value, then compare it with another value which is also converted to floating point value with floatval(). These two values are the same when using var_dump() to output, the two outputs are float(8.87), they are the same. But when comparing them for equality, the result is weird., they are not equal. Why?To analyze this question, we need to start with PHP data types. PHP uses weak types. In PHP...
PHP,floating, precision,compare,equality 2012-06-27 09:01:36
What and what not to log while debugging
Log is a critical part of an application. It serves as an eye to the programmer on how the application is working while debugging. Especially for applications running on production environment, if the application encounters problem and the problem cannot be reproduced on other environments, log will be extremely useful. While log is essential, but developers have to log smartly. Because if don't put log smartly, you may not get what you want while debugging or you may get too many...
PROGRAMMING,DEBUG,LOG,SUPPORT 2016-03-14 08:09:03
Code reviews in the 21st Century
There's an old adage that goes something like: 'Do not talk about religion or politics'. Why? Because these subjects are full of strong opinions but are thin on objective answers. One person's certainty is another person's skepticism; someone else's common sense just appears as an a prior bias to those who see matters differently. Sadly, conversing these controversial subjects can generate more heat than light. All too often people can get s...
Code review,21 Centuary 2012-02-10 06:39:14
Is Shared Hosting Secure?
Shared hosting is incredibly popular with users who are looking for the cheapest hosting available – the problem is that along with the low price you get poor performance and even more concerning – questionable security. When running on a shared host dozens if not hundreds of other sites are running on the same servers – this means any single security flaw in any of those applications can compromise the entire server. This dramatically increases the odds of your ...
Shared hosting,Virtual host,Security,Data security 2012-02-14 10:48:59
How NOT to teach a computer language
For the past year or so my wife has been taking online classes to get a computer science degree. For most of her classes she’s done great, she’s been flying through HTML and SQL, even up to the point where she can handle multilevel joins and optimizing through indexes. That was until she hit her vb.net class. I had no idea why she was having problems with a language has easy as vb.net so I started helping her out and find out why she was having so many problems. I’ve also ad...
Programming,Teach,Book,Grade,Method,Computer 2011-11-06 14:52:13
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