Topics: Computer, Personal computer, Binary numeral system Pages: 10 (3043 words) Published: February 11, 2013

Set of tools, processes, and methodologies (such as coding/programming, data communications, data conversion, storage and retrieval, systems analysis and design, systems control) and associated equipment employed to collect, process, and present information. In broad terms, IT also includes office automation, multimedia, and telecommunications

* EDUCATION Computers are used in schools for teaching Computers are used for mathematical calculation Students can do their work by using computer * BANK Computers are used in banks for storing information about different account holders. Computers help in keeping a record of the cash. Computers help in giving all kinds of information regarding any account in the bank * ENTERTAINMENT Computers are used for playing games, listening to music and watching movies. Computers are used for making cartoon movies and animation films. Computers are used for making drawings. * RAILWAY STATIONS and AIRPORTS Computers help in giving information about ticket reservations and bookings. Computers help in giving information about the arrival and departure timings of trains and airplanes. Computers help in keeping records of all the passengers. * OFFICE Computers are used to type and print documents, letters, etc. Computers help in keeping records of office employees. Computers help in sending e-mails * HOSPITALS computers help in keeping records of all the patients in hospital. Computer help doctors in controlling operation theatre machines. Computer help in doing a number of medical tests. * DEFENCE Computer help in launching of missiles id defense. Computer help in keeping records of criminals. Computer help in controlling their functions. Computer help in establishing communication links between the soldiers and their commanders through satellites. * DESIGNING Computer help in designing magazines, newspapers, books, advertisement, etc.

* Zero Generation (87 BC- 1941)
* 87 BC. - In Greece was made "Antikythera mechanism" a mechanical device based on the gears, which is a specialized astronomical calculator. * 1492 - Leonardo da Vinci in one of his diaries leads sketch 13-bit adder with desyatizubtsovymi rings. While operating the device on the basis of these drawings was constructed only in the XX century, yet the reality of the project Leonardo da Vinci was confirmed. * 1623 - Wilhelm Schickard, Professor at the University of Tuebingen, is developing a device based on gear ("few hours") for the six-digit addition and subtraction of decimal numbers. Whether the device is implemented during the life of the inventor, it is not known, but in 1960 it was re-established and has shown itself quite workable. * 1630 - Richard Delamaine creates a circular slide rule.

* 1642 - Blaise Pascal is "Pascaline" the first effective implementation and what has become known mechanical digital computing device. The prototype device summarized and subtracts pyatirazryadnye decimals. Pascal produced more than ten such calculators, the latter model numbers were operated with eight decimal places. * 1673 - The famous German philosopher and mathematician Gottfried Wilhelm Leibniz constructed a mechanical calculator which, using a binary system perform multiplication, division, addition and subtraction. * 1723 - German mathematician and astronomer, Christian Ludwig Gersten on the work of Leibniz created an arithmetical machine. The machine counted the private and the number of successive operations of addition by multiplying the numbers. In addition, it was envisaged the possibility of controlling the correctness of data input. * 1786 - German military engineer Johann Muller puts forward the idea of "difference engine" a specialized calculator to tabulate logarithms, calculated by the difference method. Calculator, built on stepped cylinders Leibniz, we got quite a small (13 cm in height...
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