Dec 27, 2016 03:27 AM
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(Updated Dec 30, 2016 12:33 AM)
Computer is a electronic machine so I want to tell youA computer is a device that can be instructed to carry out an arbitrary set of arithmetic or logical operations automatically. The ability of computers to follow a sequence of operations, called a program, make computers very flexible and useful. Such computers are used as control systems for a very wide variety of industrial and consumer devices. This includes simple special purpose devices like microwave ovens and remote controls, factory devices such as industrial robots and computer assisted design, but also in general purpose devices like personal computers and mobile devices such as smartphones. The Internet is run on computers and it connects millions of other computers.
Since ancient times, simple manual devices like the abacus aided people in doing calculations. Early in the Industrial Revolution, some mechanical devices were built to automate long tedious tasks, such as guiding patterns for looms. More sophisticated electrical machines did specialized analog calculations in the early 20th century. The first digital electronic calculating machines were developed during World War II. The speed, power, and versatility of computers has increased continuously and dramatically since then.
Conventionally, a modern computer consists of at least one processing element, typically a central processing unit(CPU), and some form of memory. The processing element carries out arithmetic and logical operations, and a sequencing and control unit can change the order of operations in response to stored information. Peripheral devices include input devices(keyboards, mice, joystick, etc.), output devices(monitor screens, printers, etc.), and input/output devices that perform both functions(e.g., the 2000s-era touchscreen). Peripheral devices allow information to be retrieved from an external source and they enable the result of operations to be saved and retrieved.
Contents [hide]
1 Etymology
2 History
2.1 Pre-20th century
2.2 First computing device
2.3 Analog computers
2.4 Digital computers
2.5 Modern computers
2.6 Mobile computers become dominant
3 Programs
3.1 Stored program architecture
3.2 Machine code
3.3 Programming language
3.4 Fourth generation languages
3.5 Program design
3.6 Bugs
4 Components
4.1 Control unit
4.2 Central processing unit(CPU)
4.3 Arithmetic logic unit(ALU)
4.4 Memory
4.5 Input/output(I/O)
4.6 Multitasking
4.7 Multiprocessing
5 Networking and the Internet
5.1 Computer architecture paradigms
6 Misconceptions
6.1 Unconventional computing
7 Future
8 Further topics
8.1 Artificial intelligence
9 Hardware
9.1 History of computing hardware
9.2 Other hardware topics
10 Software
11 Languages
11.1 Firmware
12 Types
12.1 Based on uses
12.2 Based on sizes
13 Input devices
14 Output devices
15 Professions and organizations
16 See also
17 Notes
18 References
19 External links
