Tutorial by Examples: c

Basic Note Outputs

#define NOTE_C4 262 //From pitches.h file defined in [Arduino Tone Tutorial][1] int Key = 2; int KeyVal = 0; byte speaker = 12; void setup() { pinMode(Key, INPUT); //Declare our key (button) as input pinMode(speaker, OUTPUT); } void loop() { KeyVal = digitalRead(Key); i...

arduino • Audio Output

Escaping curly brackets inside a String.Format() expression

string outsidetext = "I am outside of bracket"; string.Format("{{I am in brackets!}} {0}", outsidetext); //Outputs "{I am in brackets!} I am outside of bracket"

C# Language • String.Format

Distance Filter using

Example : CLLocationManager *locationManager = [[CLLocationManager alloc] init]; locationManager.delegate = self; locationManager.desiredAccuracy = kCLLocationAccuracyBest; locationManager.distanceFilter = 5; E.g. In the above example code above, location changes of less than 5 m...

iOS • CLLocation

IronPython is written in pure c#

IronPython is completly written using managed .net (c#) code. So all builtin python methods and libraries (such as next(), int(), etc.) are writtin in .net. This example shows the implementation of len() for a list of different types (only a few): .... public static int len([NotNull]List/*!*/ l...

ironpython • Difference between Python and IronPython

Basic View

index.html <html> <head> <title>Angular-UI Router Example</title> <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.4.9/angular.js"></script> <script type="text/java...

angular-ui-router • Getting started with angular-ui-router

Vector Iterator

begin returns an iterator to the first element in the sequence container. end returns an iterator to the first element past the end. If the vector object is const, both begin and end return a const_iterator. If you want a const_iterator to be returned even if your vector is not const, you can use ...

C++ • Iterators

Declaring permissions in your manifest file

Any permission required by your application to access a protected part of the API or to interact with other applications must be declared in your AndroidManifest.xml file. This is done using the <uses-permission /> tag. Syntax <uses-permission android:name="string" android...

Android • The Manifest File

Const local variables

Declaration and usage. // a is const int, so it can't be changed const int a = 15; a = 12; // Error: can't assign new value to const variable a += 1; // Error: can't assign new value to const variable Binding of references and pointers int &b = a; // Error: ca...

C++ • const keyword

Const pointers

int a = 0, b = 2; const int* pA = &a; // pointer-to-const. `a` can't be changed through this int* const pB = &a; // const pointer. `a` can be changed, but this pointer can't. const int* const pC = &a; // const pointer-to-const. //Error: Cannot assign to a const reference *pA = b...

C++ • const keyword

Create Single Gift Card

// Instantiate Gift Card Model $gift_card = Mage::getModel('enterprise_giftcardaccount/giftcardaccount'); // Populate Gift Card values $gift_card // Your redeemable code, doesn't have to be in this format. ->setCode('2i2j2j-24k1ii1-67774k-231l') // Also has STATUS_DISABLED ...

magento • Create Enterprise Gift Cards Programmatically

Return in a lock statement

Following code will release lock. lock(locker) { return 5; } For a detailed explanation, this SO answer is recommended.

C# Language • Lock Statement

Mistakenly writing = instead of == when comparing

The = operator is used for assignment. The == operator is used for comparison. One should be careful not to mix the two. Sometimes one mistakenly writes /* assign y to x */ if (x = y) { /* logic */ } when what was really wanted is: /* compare if x is equal to y */ if (x == y) { ...

C Language • Common pitfalls

Incautious use of semicolons

Be careful with semicolons. Following example if (x > a); a = x; actually means: if (x > a) {} a = x; which means x will be assigned to a in any case, which might not be what you wanted originally. Sometimes, missing a semicolon will also cause an unnoticeable problem: if (i &lt...

C Language • Common pitfalls

Getting a shell into a running (detached) container

Log into a running container A user can enter a running container in a new interactive bash shell with exec command. Say a container is called jovial_morse then you can get an interactive, pseudo-TTY bash shell by running: docker exec -it jovial_morse bash Log into a running container with a s...

Docker • Running containers

Pipelines via the CLI

Installing pipeline Once Heroku Toolbelt is installed it requires Pipelines plugin too. heroku plugins:install heroku-pipelines Creating pipelines You must start with an app to add to the pipeline, although it doesn’t have to be for a particular stage. If you don’t specify --stage STAGE, the...

heroku • Pipelines

Instance methods

An instance method is a method that's available on a particular instance of a class, after the instance has been instantiated: MyClass *instance = [MyClass new]; [instance someInstanceMethod]; Here's how you define one: @interface MyClass : NSObject - (void)someInstanceMethod; // "-&qu...

Objective-C Language • Methods

Basic example

This example shows setting up a small application with 3 routes, each with it's own view and controller, using the controllerAs syntax. We configure our router at the angular .config function We inject $routeProvider into .config We define our route names at the .when method with a route defini...

AngularJS • Routing using ngRoute

Using an extension method for collection initialization

Collection initialization syntax can be used when instantiating any class which implements IEnumerable and has a method named Add which takes a single parameter. In previous versions, this Add method had to be an instance method on the class being initialized. In C#6, it can also be an extension me...

C# Language • C# 6.0 Features

Simple Actor DSL

To create simple actors without creating a new class, you can use: import akka.actor.ActorDSL._ import akka.actor.ActorSystem implicit val system = ActorSystem("demo") val a = actor(new Act { become { case "hello" ⇒ sender() ! "hi" } })

akka • Actor DSL

Context switching

The two possible ways of issuing a context.become (replacing or adding the new behavior) are offered separately to enable a clutter-free notation of nested receives: val a = actor(new Act { become { // this will replace the initial (empty) behavior case "info" ⇒ sender() ! "A...

akka • Actor DSL