Module 15 Programming and Scripting

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MVC

- a development technique used in the implementation of user interfaces - separates the user interface into different components

Model Layer

- can take on different forms - an actual object that is an actual implementation of the application - where the business logic is designed

Hexadecimal

- composed of chunks of 4 binary numbers to make binary easier to read - 64 bits (8 bytes) - (base 16) - can represent any number using 16 digits 0 -9 and A-F

Octal

- group binary into chunks of 3 to make reading and storing easier. - 32 bits (4 bytes) - (base 8) - can represent any number using 8 digits 0 -7

The logic tier

- resides on the organization's servers - a conduit through which the data flows to the user from the databases as well as how data input from the user is used to update the underlying records in the database. - where the system performs its logic processing

Controller Layer

- the part of an application that interacts with the user (via the view) and passes along the user requests to the model - where the input logic is designed

data tier

-resides on the organization's servers and usually on a separate database server -where data are stored, retrieved, and updated from database tables

Text - 1 character =

1 byte

Two common forms of character representation

ASCII (American Standard Code for Information Interchange) and Unicode

Most common high-level languages used to write programs

Basic C C++ Java Python FORTRAN Ada Pascal

Digital system

Binary Information is stored in one of two ways Current or No Current

The ______ was a major factor in the development of scripting languages because they _____

Internet, commonly add functionality to a Web page by influencing the data that the user sees in a browser window

The most distinct difference between interpreted and compiled programming...

Interpreted programming is more experimental in nature and developing a program can be done in a piecemeal manner. Compiled programming often requires that the entire program be written before any of it can be compiled and tested.

Most common scripting Languages

JavaScript ASP JSP PHP Perl Tcl Python

MVC stands for

Model-View-Controller

Interpreter

Takes the most recently entered instruction, translates it into machine language, and executes it.

What is the difference between the MVC model and N-tier development model?

The MVC model is one application where the various design logic (input, business and interface) are logically separated. This differs from the n-tier development model where each tier is a separate application

Compiler

Translates the entire program, creating an executable program, which can be run at a later time.

bit

a single 1 or 0 value

Advantage of a interpreted language

allows the programmer to experiment while developing code

script

an interpreted program that is typically fairly short and the instructions are relatively simple (as compared to applications or systems software).

When writing an algorithm one should strive to make it ____.

as clear and simple as possible

Translators for each type of languages are

assembly compilers interpreters

3 Types of language translators

assembly languages high-level compiled languages high-level interpreted languages

Scripts have traditionally been used for____ rather than for _____

automation, software development

Decimal system

base 10 - can represent every number with some combination of 10 digits (0-9)

Binary System

base 2 - can represent any number using 2 digits 0 or 1

A program written in a high-level language must be _____ to be executed by the computer

converted into machine code

JavaScript

designed to be used inside a web browser environment

Disadvantage to interpreted programming

every instruction is translated first and then executed; this must be done every time the program is run whereas once a program is compiled, the chore of translation is over.

algorithm

is a formula or procedure for solving a problem.. more specifically, a set of steps that are followed in order to complete a computer process

The presentation tier

is where the user interface for the system is developed.

A disadvantage of a compiled language

it is not portable it is translated into machine code that is compatible with a specific type of computer. The program itself is portable in that it can be compiled differently for different computers.

language translator

program that takes one program, written in a high-level language, as input, and creates a machine language program as output.

Scripting languages

specific interpreted programming languages

n-tier development is often used to indicate what?

that the number of tiers a system will be broken down into will vary between different software development projects

MVC components are...

the model, the view, and the controller.

In typical n-tier development projects, the tiers are divided between

the presentation tier, the logic tier, and the data tier

View Layer

user interface

Programming language

vocabulary and set of rules for instructing a computer to perform certain tasks


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