Software Development Life Cycle – Unified Process

The development of software includes a series of steps kwown as the Software Development Life Cycle. A modern method of of SDLC is known as the Unified Process. This post has been created to list the steps involved within the Unified Process.

  1. Business Modeling
  2. Requirements Discipline
  3. Design Discipline
  4. Implementation
  5. Testing Discipline
  6. Deployment Discipline

Unified Model

Reference:
Burd, S. (2006). Systems Architecture, 5th edition, Thomson Learning, Boston, Massachusetts.

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Learn PHP in 24 Hours

SAMS Teach Yourself PHP in 24 Hours, 3rd Edition courtesy of the Association for Computing Machinery

This post was created as a reference point.

PHP Standard Data Types

There are 6 standard data types in PHP. They are:

  • Integer
  • Double
  • String
  • Boolean
  • Object
  • Array
  • There are also 2 Special Data Types. They are:

  • Resource
  • Null
  • Testing for a specific data type.

    Functions to test data types

  • is_array()
  • is_bool()
  • is_double()
  • is_int()
  • is_object()
  • is_string()
  • is_null()
  • is_resource()
  • Operators and Expressions

    An operator is a symbol or series of symbols that, when used in conjunction with values, performs an action and usually produces a new value.

    An ...

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    Bit Decryption Algorithm 1:3 Ratio

    This article is focused on how it is possible that an algorithm can read 1 bit of data yet store the results of 3 bits.

    The concept behind this idea is quite simple. We know that bits are sent via an encoded signal from the CPU of an informaton system. It is also known, that at the base of all CPU’s, the machine language is based on binary bits, represented as values of 1 or 0.

    Here is an example of how the bit string ...

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    JavaScript Basics

    Basics of JavaScript

    This article was created to outline the basics of the JavaScript langauge.

    JavaScript – Unsupported Browsers

    When JavaScript is run in an unsupported browser, the script itself might be displayed as text within the browser. To prevent this from happening, it is best to use the HTML comment feature to comment out the code from the script.

    For example:
    <SCRIPT TYPE="text/javascript">
    <!--  HIDE THE SCRIPT
    FROM OTHER BROWSERS

    JavaScript program
    //
    STOP HIDING FROM OTHER
    BROWSERS  -->

    </SCRIPT>
    HTML is commented ...

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    Floating Point Numbers

    Floating Point Numbers

    While working on a JavaScript calculator I became stuck in what should be simple mathematics. The use of decimal points resulting in addition and subtraction caused erros in the calculations. The cause is in the way machine language calculates decimal points.

    Oracle offers some great insight into the cause and resolution: What Every Computer Scientist Should Know About Floating-Point Numbers

    The JavaScript Budget Calculator is a work in progress, to view how a machine interprets decimals check out ...

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    Javascript Calculator

    JavaScript Calculator

    For a demo of the JavaScript calculator, click here
    *You must have a JavaScript enabled browser for the JavaScript Calculator demo to work.

    This calculator was created during a MindLeaders JavaScript tutorial. For more information on Mindreaders Tutorials and Training, go to:
    http://www.mindleaders.com

    JavaScript Calculator Source Code

    <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN”
    “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”>
    <html xmlns=”http://www.w3.org/1999/xhtml”>

    <head>
    <meta content=”text/html; charset=utf-8″ http-equiv=”Content-Type” />
    <title>JavaScript Calculator</title>
    <script type=”text/javascript”>

    var total = 0;
    var lastOperation = “+”;
    var newnumber = true;

    function enterNumber(digit) {
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    Problem Solving Methodologies

    Problem solving techniques can be applied to both life and the field of computer science. In both instances, there are different methodologies that can be applied; for, the use of a specific methodology is directly dependent on the type of problem that must be solved.

    This article will define the different types pf problem solving methodologies, as well as the different types of problems they can solve.

    Request-Response-Result MethodologyResponse-Request-Result

    The request-response-result methodology works best ...

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