Computer Science

All you need to know about the basics of information technology

The concept of the operating system

To force PC to perform any action, you need to create for him a consistent set of instructions, i.e. a program. The application program is directly engaged in the performance of any necessary user (text editors, spreadsheets, databases, graphics packages, communications software). Tool system (system programming) creates new programs for computers.

Inside the system unit of a computer

CPU signifies a tiny silicon crystal using a large variety (a few million) put there transistors. Even the CPU can be known as the processor, a Microprocessor (MP) those phrases have lately become interchangeable.

Basic surgeries in inch minute, MHz. Intel 8088 needed a clock rate of 4.77 MHz. These amounts have now grown to tens of thousands of MHz (Celeron 600 MHz).

Information and how to measure it

Reading Papers and books, playing radio, watching television, each 1 of you personally (voluntarily or involuntarily) absorbs advice. Within a instinctive, regular feel underneath the advice know that the info, comprehension, anybody who's in in. And also the further information given, the more further info (in the uncharted point of opinion) which they feature.

Cycles in CS

Who among us does not remember an instructive story about how Tom Sawyer's aunt Polly's job was painting the fence: "Sighing, he dipped the brush into the bucket, picked up a Board fence, repeated the operation did it again..." (mark TWAIN. The Adventures Of Tom Sawyer).

Let us construct the algorithm for painting the fence. Suppose that we have a paint brush and enough paint. Write, for example, the following sequence of actions:

The concept of algorithm

We all use different algorithms, instructions, rules, recipes, etc. Usually we do it without thinking. For example, opening the door with a key no one's wondering in what order to perform actions. However, to someone (say, younger brother) to teach to open the door, will have to clearly specify the actions themselves, and the order of their execution. For example: