What Computer is
A device that runs programs for displaying and manipulating text, graphics, symbols, audio, video, and numbers.
A computer accepts information in the form of digital data. Complex computers also include the means for storing data (including software programs). A program may be built into the computer (in the logic circuitry, located on the microprocessors), or may be loaded into the computer's storage and then started by an administrator or user. Today's computers have both kinds of programming.
Most histories of the modern computer begin with the Analytical Engine envisioned by Charles Babbage, who followed the mathematical ideas of George Boole (see: Boolean logic), the mathematician who first stated the principles of logic inherent in today's digital computer. Babbage's assistant and collaborator, Ada Lovelace, is said to have introduced the ideas of program loops and subroutines and she is sometimes considered the first programmer.
Modern computers inherently follow the ideas of the stored program laid out by John von Neumann in 1945. Essentially, the program is read by the computer one instruction at a time; an operation is performed, then the computer reads the next instruction, and so on.
Prior to the PC, which is small and affordable, computers were large and expensive. Companies enabled multiple users to share the computer resources through attached terminals. Starting in the late 1980's, technological advances made it feasible to build smaller-sized computers that individuals could use independently, whether at work or at home. These were then "networked into" the larger system.
Recently, computers and programs have been devised that allow multiple programs (and computers) to work on the same problem, at the same time, in parallel (see: network computing). For many users, though, a computer acts only as a "glorified typewriter," used to cut-and-paste objects and to save documents. But computers can also perform a variety of other tasks, such as accounting and desktop publishing.
A computer system includes peripherals, such as hard and floppy disk drives, a monitor, a mouse, the operating system, software, and a printer. All of these components are designed to work together. You need a computer to access the Internet, browse the Web, and send or receive e-mail, among other things.
The meaning of Object-oriented programming (OOP)
A type of programming that combines data structures with functions to create reusable objects. It works something like this: Programmers can create modules that do not need to be changed when a new type of object is added; instead, one can simply create a new object that inherits many of its features from existing objects. This inheritance relationship between objects makes object-oriented programs easier to modify than procedural programming techniques.
The most popular object-oriented programming languages are Java and C++. There is also UML (Unified Modeling Language) which is the industry-standard language for specifying, visualizing, constructing, and documenting the artifacts of software systems. It simplifies the complex process of software design, making a "blueprint" for construction.
"Object-oriented" can also be used to describe a system that primarily deals with different types of objects, where the actions you take depend on what type of object you are manipulating. For example, an object-oriented graphics program might enable you to draw many types of objects, such as circles, rectangles, and triangles. Applying the same action to each of these objects, however, would produce different results. If the action is "Make 3-D," for instance, the result would be a sphere, a box, and a pyramid, respectively.
Object-oriented graphics are also called vector graphics.
Choose a category: