Notes, summaries, assignments, exams, and exercises for Computer science for Baccalaureate

Javascript Continued

OPENFLOW:

defines OpenFlow as the first standard communications interface defined between the control and forwarding layers of an SDN architecture. OpenFlow allows direct access to and manipulation of the forwarding plane of network devices such as switches and routers, both physical and virtual 

OPENFLOW CONFIG CONCEPTS

OF Capable Switch: Physical OF switch.  Can contain one or more OF logicalswitches.

OpenFlow Configuration Point: configurationservice

OF Controller: Controls logical switch via OFprotocol

Operational Context: OF logicalswitch

OF Queue: Queues of packets waiting forforwarding

OF Port: forwarding interface. May be physical orlogical.

OF Resource: ports, queues, certificates, flow tables and other  resources of OF capableswitches 

Introducing Networks

A network is created when more than one device is connected together. A network can be a small collection of computers connected within a building (e.g. a school, business, or home) or it can be a wide collection of computers connected around the world.

Advantages

• Communication – it is easy (and often free) to communicate using email, text messages, voice calls, and video calls.
• Roaming – if information is stored on a network, it means users are not fixed to one place. They can use computers anywhere in the world to access their information.
• Sharing information – it is easy to share files and information over a network. Music and video files, for instance, can be stored on one device and shared across many computers, so

Constructor

A constructor is a special method in object-oriented programming that is automatically called when an instance (object) of a class is created. The main purpose of a constructor is to initialize the object's attributes (properties) and allocate resources if needed. Constructors have the same name as the class and do not have a return type.

Example of a Constructor

Here is an example in Python:

class Person:
    def __init__(self):
        self.name = "John Doe"
        self.age = 30

# Creating an instance of the Person class
person = Person()

print(person.name)  # Output: John Doe
print(person.age)   # Output: 30

In this example, __init__ is the constructor method in the Person class. It initializes the name and age attributes of the...

Understanding Window Elements

Standard Window Components

1. Control Menu: Displays a menu with options to restore, move, size, minimize, maximize, and close the window.
2. Toolbar: Provides direct access to frequently used display options for greater efficiency.
3. Title Bar: Displays the name of the window or application.
4. Menu Bar: Displays and provides access to the menus available within the application.
5. Work Area: The primary area provided by the application for the user to perform their work.
6. Window Border: Allows you to resize the window when it is not maximized. Place the mouse pointer on the border, then press and drag it to the new position.
7. Status Bar: Displays help or information about the current task or ongoing processes.

Window Control Buttons

• A.

• A class is a template used to create objects and declare data types and methods in a program.
• Public - Modifier used to declare classes and interfaces. Void - Method that returns no value. Main - Marks the start and end of program execution.
• Scanner class - Used to get user input for types like String and Int.
• Exceptions: Try-catch block, throw statement.
• Inheritance provides a powerful and natural mechanism for organizing and structuring software programs. It improves clarity in the design of classes.
• A subclass provides specialized behavior based on elements provided by the superclass. Using inheritance, programmers can reuse the code in the superclass many times.
• Reading and Writing to Files:
  1. Import java.io file.
  2. File inputFile = new File("input.

Loop Invariant:

Big-Theta, Big-Oh, Big-Omega

Explanation

10.1 Pivot tables

What is a pivot table? It is one of the most powerful tools in Excel. They are also called “dynamic” because the data on them can be changed by rearranging or changing the position of the column and row headers in an easy and quick way.

The use of a dynamic table is to obtain information summaries from our data grid in order to be able to quickly analyze big volumes of information. These type of tables can be used in situations such as:

• When you have a table with rows that have different date and you need to organize the information by time periods (month, semester, etc.)
• When you need to change the arrangement in the rows or column cells to show different perspectives from the same data set.

Follow these steps to...

Importing Bitmap Images into Fireworks

Defining the Canvas

The first step is defining the work area or canvas (remember to have the negative area visible). Then, select the import option from the File menu.

A window like the one below will open.

Locating and Selecting the Image

In the Look in option, you'll search the folder where your image is saved. In the Files of type menu, the formats that Fireworks recognizes are shown. Once you select the file, click Open.

Placing the Image

The following mark will be displayed on the canvas, which means Fireworks is ready to bring in the selected image.

Simply click with your mouse or try to trace the desired size of the image.

That way, the image will appear on the canvas.

Image Properties

This image's properties...