Tutorial by Examples: l

C++ #include "opencv2/objdetect/objdetect.hpp" #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include <iostream> #include <stdio.h> using namespace std; using namespace cv; // Function Headers void detectAndDisp...

There is a useful package in Python - chardet, which helps to detect the encoding used in your file. Actually there is no program that can say with 100% confidence which encoding was used - that's why chardet gives the encoding with the highest probability the file was encoded with. Chardet can dete...

This example has more tests available in unit testing. Employee.vb (Class Library) ''' <summary> ''' Employee Class ''' </summary> Public Class Employee ''' <summary> ''' First name of employee ''' </summary> Public Property FirstName As String = &q...

Animation to show how selection sort works Below example shows selection sort in ascending order: public class MySelectionSort { public static int[] doSelectionSort(int[] arr){ for (int i = 0; i < arr.length - 1; i++) { int index = i; ...

Many Flask applications are developed in a virtualenv to keep dependencies for each application separate from the system-wide Python installation. Make sure that mod-wsgi is installed in your virtualenv: pip install mod-wsgi Then create a wsgi wrapper for your Flask application. Usually it's kep...

The advantage of using Apache over the builtin werkzeug server is that Apache is multi-threaded, meaning that multiple connections to the application can be made simultaneously. This is especially useful in applications that make use of XmlHttpRequest (AJAX) on the front-end. /etc/apache2/sites-ava...

To set the environment to Development SET ASPNETCORE_ENVIRONMENT=Development Now running an Asp.Net Core application will be in the defined environment. Note There should be no space before and after the equality sign =. The command prompt should not be closed before running the application b...

Homebrew calls itself 'the missing package manager for macOS'. It can be used to build and install applications and libraries. Once installed, you can use the brew command to install PostgreSQL and it's dependencies as follows: brew update brew install postgresql Homebrew generally installs the...

The single line comment begins with "//" or "#". When encountered, all text to the right will be ignored by the PHP interpreter. // This is a comment # This is also a comment echo "Hello World!"; // This is also a comment, beginning where we see "//" ...

The multi-line comment can be used to comment out large blocks of code. It begins with /* and ends with */. /* This is a multi-line comment. It spans multiple lines. This is still part of the comment. */

The following are the steps that you will need to follow to setup mysql datasource in JBoss AS 7. Download the MySQL jdbc zip file from here: Create a directory mysql inside /jboss-as-7.1.1.Final/modules/com Inside that create a directory structure like the following: /jboss-as-7.1.1.Final/m...

The <header> element represents introductory content for its nearest ancestor sectioning content or sectioning root element. A <header> typically contains a group of introductory or navigational aids. Note: The header element is not sectioning content; it doesn’t introduce a new secti...

The <footer> element contains the footer part of the page. Here is an example for <footer> element that contain p paragraph tag. <footer> <p>All rights reserved</p> </footer>

local collections are not allowed in select statements. Hence the first step is to create a schema level collection. If the collection is not schema level and being used in SELECT statements then it would cause "PLS-00642: local collection types not allowed in SQL statements" CREATE OR R...

When mapping our entities to database table names we rely on a @Table annotation. But if we have a naming convention for our database table names, we can implement a custom physical naming strategy in order to tell hibernate to calculate table names based on the names of the entities, without explic...

from flask import Flask, render_template, redirect, url_for app = Flask(__name__) @app.route('/') def main_page(): return render_template('main.html') @app.route('/main') def go_to_main(): return redirect(url_for('main_page'))

# ... # same as above @app.route('/welcome/<name>') def welcome(name): return render_template('main.html', name=name) @app.route('/login', methods=['GET', 'POST']) def login(): if request.method == 'POST': # ... # check for valid login, assign username ...

Multiton can be used as a container for singletons. This is Multiton implementation is a combination of Singleton and Pool patterns. This is an example of how common Multiton abstract Pool class can be created: abstract class MultitonPoolAbstract { /** * @var array */ protec...

This pattern can be used to contain a registered Pools of Singletons, each distinguished by unique ID: abstract class MultitonRegistryAbstract { /** * @var array */ protected static $instances = []; /** * @param string $id */ final protected function ...

To use auto layout we need to enable a boolean flag in storyboard. Its shown in the below image. After this we can use auto layout in our storyboard. There is another option if we want to use size classes or not. Size class is also a helpful option in auto layout which helps us to design for differe...