Convergence of E-Commerce Technology
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E-Commerce Payment
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E-Commerce
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e-commerce - Business to Business E-Commerce…….
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E-Commerce - Business to Consumer E-Commerce
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e-commerce - Business to Business E-Commerce…….
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Fwd: The Technical Components of an E-Commerce System
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ISDN (Integrated Services Digital Network)
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programming language.......................
http://www.lecturetheory.blogspot.com/ *History of Prog**rammi**ng* *What is a P**rogramming Language * - Programming language is a set of words, symbols, and codes that enables a programmer to communicate a solution algorithm to a computer - It is needed to allow human begins and computers to talk to each other - A programmer can use a variety of programming languages to code a progr - A program development tool consists of user-friendly software products designed to assist both programmers and non-technical users with the creation of information system solutions. *Generation of Programming Langu* - The *first generation *of language was the machine language. The machine language instruction uses a series of binary digits or a combination of numbers and letters that represents binary digits. Instructions and addresses were numerica - The *second generation* of language was the symbolic instructions or mnemonics and addresses. To convert the assembly language source programme into machine language, you use an assembler. Example, IBM, BAL and VAX macro. - The *third generation* language was the programmer concentration of structured programming and database management. It is a procedural language that requires the programme instruction to tell the computer what to accomplish and how to do it. Example, FORTRAN, ADA, COBOL, Pascal, C and BASIC. - The *fourth generation* (4GL) was the non-procedural type language. The programmer only specifies what the programme should accomplish without explaining how. Example. SQL, Postscript, and relational database orientation. - The *fifth generation* (5GL) was concerned on Artificial Intelligence and Fuzzy Logic. * * *Advantages and disadvantages of each generation **of language* - Readability of the language - Ease of writing the language - Reliability of the language - Cost of development - Syntax complexity - Language standards *Language Models* - Imperative Languages - Functional Languages - Logic Programming - Object-oriented - Declarative - Scripting - Parallel *Object –Oriented Progr**amming and Concepts* *Introduction to Object Oriented Programming and con**cepts* *What is OOP?* - A revolutionary concept that changed the rules in computer programme development, object-oriented programming (OOP) is organised around objects rather than actions, data rather than logic.** - Object-orientation is a technique for system modeling. *Object oriented programming provides:* - A system that can be constructed from a set of objects - New abilities to existing objects that can expand a system - Creating new objects can expand a system *Object*:-is an entity able to save a state (information) and which offers a number of operations (behavior) to either examine or effect of this state. *Class*:-represents a template for several objects and describes how these objects are structured internally. Objects of the same class have the same definition both for their operations and for their information structure. *An instance*:-is an object created from a class. The class describes the structure of the instance, while the current state of the instance is defined by the operations performed on the instance. *Polymorphism* means that the sender of a stimulus does not need to know the receiving instance's class. The receiving instance can belong to an arbitrary. *Inheritance*:- As objects do not exist by themselves but are instances of a *CLASS*, a class can inherit the features of another class and add its own modifications. (This could mean restrictions or additions to its functionality). *Inheritance aids in the reuse of code. *Classes can have *'Children' *that is, one class can be created out of another class. The original or parent class is known as the *SuperClass *(or base class). The child class is known as the *SubClass *(or derived class). *Encapsulation (or information hiding)*:-is a principle, about hiding the details of the implementation of the interface. It is to reveal as little as possible about the inner workings of the Interface. http://www.lecturetheory.blogspot.com/ --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups zilliontechnologies group. To post to this group, send email to zilliontechnologies@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/zilliontechnologies?hl=en -~--~~~~--~~--~--~---
Introduction to E-Commerce
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Introduction to E-Commerce
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