Concepts Of Computer Science And Programming: Oop And Others

860 words - 3 pages

As many much smarter than I have said first, Computer Science is a very inadequate term for the concept it describes. Firstly, it is not a science: it is a little of engineering, math, and even art. Secondly, it may or may not have to do with computers. Computer science is the structured expression of declarative knowledge. It is a form of putting into existence things we know to be true. It is a declaration of logic that, with mathematical certainty, is formulated to create logical solutions working with any amount of data. Computers programming are a tools of computer science, as a ruler and protractor are tools of geometry. Programming is defined in Princeton University as1.setting an order and time for planned events [syn: scheduling]2.creating a sequence of instructions to enable the computer to do something [syn: computer programming] (1)There is very little scientific reason about that definition, and following it, programming can very well be done on a piece of paper as well as a computer.To explain different computer science concepts, I will talk about different programming techniques. Roughly speaking, I distinguish programming between the following stages (programming is best learned going down this list I think):·Unstructured programming·Procedural programming·Modular programming·Object-oriented programmingUnstructured programming creates small programs made up completely of a "main program" which contains a sequence of commands (or statements) which modify data that is shared with everyone (it is global) throughout the whole program (see fig.1). Programming in the TI-83, TI-86, and some BASIC languages limits you to this kind of programming. It is very limited and unorganized.This programming technique provides extreme disadvantages once the program grows to be sufficiently complex. For example, if the same statement sequence is needed at different parts of the program, the sequence must be exactly copied (a dozen, two dozen, a hundred times?). The three commands in Figure 1 may be repeated later on. A simple solution has been derived from this problem: the ability to extract certain commonly used sequences, name them, and offer a technique to call them and return from them at any time.This solution is called procedural programming. Procedural programming is programming which works with the idea of extracting a piece of logic (code, when programming) and treating it as a separate procedure (or function). A procedure call (function call) is a statement used to invoke the procedure and process it (see fig.2). Once processed, program flow is returned to right after the function call. A procedure may be called once, twice, or a...

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