Tutorial by Examples: all

realloc is conceptually equivalent to malloc + memcpy + free on the other pointer. If the size of the space requested is zero, the behavior of realloc is implementation-defined. This is similar for all memory allocation functions that receive a size parameter of value 0. Such functions may in fact ...

Detailed instructions on getting pthreads set up or installed.

Sometimes a new Java programmer will write code like this: public void check(boolean ok) { if (ok == true) { // Note 'ok == true' System.out.println("It is OK"); } } An experienced programmer would spot that as being clumsy and want to rewrite it as: publ...

$ npm install -g parse-server mongodb-runner $ mongodb-runner start $ parse-server --appId APPLICATION_ID --masterKey MASTER_KEY --databaseURI mongodb://localhost/test You can use any arbitrary string as your application id and master key. These will be used by your clients to authenticate with...

file:write_file("myfile.txt", ["Hi " [<<"there">>], $\n]).

["Guten Tag " | [<<"Hello">>]]. [<<"Guten Tag ">> | [<<"Hello">>]]. [$G, $u, $t, $e, $n , $T, $a, $g | [<<"Hello">>]]. [71,117,116,101,110,84,97,103,<<"Hello">>].

The following example uses allow and receive to stub a Cart's call to a CreditCardService so that the example doesn't have to wait for a network call or use a credit card number that the processor knows about. class Cart def check_out begin transaction_id = CreditCardService.instance...

Some programmers think that it is a good idea to save space by using a null to represent an empty array or collection. While it is true that you can save a small amount of space, the flipside is that it makes your code more complicated, and more fragile. Compare these two versions of a method for ...

On StackOverflow, we often see code like this in Answers: public String joinStrings(String a, String b) { if (a == null) { a = ""; } if (b == null) { b = ""; } return a + ": " + b; } Often, this is accompanied with an asse...

Detailed instructions on getting filemaker set up or installed.

Detailed instructions on getting yarn set up or installed. If you have npm installed on your system: npm install --global yarn On macOS: via Homebrew: brew install yarn via MacPorts: sudo port install yarn (node will be installed if not present) On Windows: via Chocolatey: choco install...

Some Java programmers have a general aversion to throwing or propagating exceptions. This leads to code like the following: public Reader getReader(String pathname) { try { return new BufferedReader(FileReader(pathname)); } catch (IOException ex) { System.out.println(&q...

mod_rewrite must be enabled before being used on an Apache server. Debian/Ubuntu Run a2enmod rewrite Then restart Apache with service apache2 restart General case Add or uncomment the following line in the static configuration file (such as httpd.conf): LoadModule rewrite_module modules/mod_re...

Let's have a look at various options to wait for completion of tasks submitted to Executor ExecutorService invokeAll() Executes the given tasks, returning a list of Futures holding their status and results when everything is completed. Example: import java.util.concurrent.*; import ja...

Consider these two micro-benchmarks: The first benchmark simply creates, starts and joins threads. The thread's Runnable does no work. public class ThreadTest { public static void main(String[] args) throws Exception { while (true) { long start = System.nanoTime(); ...

If you need to store images or videos in the column then we need to change the value as needed by your application max_allowed_packet = 10M M is Mb, G in Gb, K in Kb

get_defined_vars() returns an array with all the names and values of the variables defined in the scope in which the function is called. If you want to print data you can use standard functions for outputting human-readable data, like print_r or var_dump. var_dump(get_defined_vars()); Note: This...

Detailed instructions on getting tizen set up or installed. You can start developing Tizen apps on commercialized devices : https://wiki.tizen.org/wiki/Devices Or https://wiki.tizen.org/wiki/ReferenceDevices Last option is to install Tizen from scratch on existing Hardware (x86, ARM etc) : htt...

// Store a reference to the native method let open = XMLHttpRequest.prototype.open; // Overwrite the native method XMLHttpRequest.prototype.open = function() { // Assign an event listener this.addEventListener("load", event => console.log(XHR), false); // Call the s...

To install and run jboss AS standalone you can follow the processes described below(assuming that you already have java 7 and jdk installed on your mac): Download the jboss application server from here. Unzip the package and extract the folders Set up the your bash_profile like the fo...