descibe the functioning of CPU.
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C.P.U is the brain of the computer it carries out the instructions of a computer programby performing the basic arithmetic, logic, controlling, and input/output (I/O) operations specified by the instructions.
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The purpose of every computer is some form of data processing. The CPU supports data processing by performing the functions of fetch, decode and execute on programmed instructions. Taken together, these functions are frequently referred to as the instruction cycle. In addition to the instruction cycle functions, the CPU performs fetch and write functions on data.
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