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A computer can process data, pictures, sound and graphics. They can solve highly complicated problems quickly and accurately. A computer performs basically five major computer operations or functions irrespective of their size and make. These are 1) it accepts data or instructions by way of input, 2) it stores data, 3) it can process data as required by the user, 4) it gives results in the form of output, and 5) it controls all operations inside a computer.

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While the functions and applications of a computer are almost endless, we can sense four primary purposes that are all linked to data (information):  Entering data, manipulating data, viewing processed data, and storing data.  Computers are designed to transform raw data into information.  The computer operates under the control of instructions stored in its own memory unit and can accept inputted data, process it aritmethically and through sequenced based logic, produce information, and store the results for future use.  All the applications of a computer derive from this basic starting point.

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basic functions of comp are input(taking data from outside sources),storage(storing that data in computer),processing(for producing the result) and output..........

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1.it is used to retrive values ,process ,store and retrive value for output 

2. used for fast callulation of data upto 18 or more decimal places 

3. search records or save data for longer period of time 

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To keep it very simple it is:

1) Input data or accepting data from the user and processing or working on it, to give the user the required result.

2) storing the input data or instructions and processing the output or giving the result.