The arithmetic logic unit (ALU) of a computer system is the place, where the actual execution of the instructions takes place during the processing operations. The data and instructions, stored in the primary storage before processing are transfered as and when needed to the ALU. No processing is done in the primary storage unit. Intermediate results generated in the ALU are temporarily transfered back to the primary storage until needed later. Hence data may move from primary storage to ALU and back again to storage many time before the processing is over.
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