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Computers are the machines that can perform tasks or calculations according to set of instructions or programs. The term computer is derived from the word compute which means to calculate. Computer is an electronic device that can perform arithmetic and logical calculations faster. The first fully electronic computers, introduced in 1940s, were huge machines that required teams of people to operate. Compared to those early machines, today's computers are not only thousand times faster, they can fit on your desk, lap and even pocket. You must appreciate the impact of computer in our day-to-day life. The computer has been useful in reservation of tickets in Airlines and Railways, payment of telephone and electricity bills, deposits etc.
Computer is an electronic data processing device capable of taking an input data, processing them and displaying the processed result at a very high speed under the control of set of instruction. The features of computer are:
Since, the computer accepts raw data as input and converts into information by means of data processing, it is called information processing machine (IPM).
Data is defined as the raw facts or symbols which are collected from various sources and need to be processed.Information is defined as the desired or meaning full result obtained after processing the data.
There common ability that every computer has are:
The circuitries of computer are designed on the basis of electrical signals and data travel them as the speed of current, therefore the computer is able to perform any task at the high speed.
Computer always produce accurate result but sometimes the wrong result produced by the computer is the outcome of wrong instructions programs given by the user level which is termed as Garbage-In Garbage-Out (GIGO).
Computer is called diligent machine because it can perform the task repeatedly without loosing its speed and accuracy for a long time.
Computer is called versatile machine because it is used in almost all the fields for various purposes.
The capabilities of computer are:
i. Computer is a device capable of storing huge amount of data in small device.
ii. Computer is device capable of calculating very fast and accurately.
The limitations of computer are:
Advantages of computer are:
Bug is an error or mistake due to the fault in computer hardware and program.
Debug is the process of removing bugs (errors) in the computer program.
The measuring unit of computer is as
|Unit||Fractions of second|
|Milliseconds(ms)||One thousandth (1/1000)|
|Micro seconds(Ms)||One millionth (1/1000000)|
|Pico seconds||One billionth (1/1000000000)|
|Nano seconds||One trillionth (1/1000000000000)|
computer is known as automatic machine because computer is diligence machine