The following events take place when a computer processes the data.
1. The programme and the necessary data are entered into the Computer System from an input device, and are stored in main memory where they can be accessed as needed.
2. Now, the C.P.U. (Central Processing Unit) retrieves the instructions from the main memory, one by one, and de-codes each instructions to determine what operation to be performed.
3. When required by instructions, the C.P.U. also retrieves the necessary data from main memory.
4. The C.P.U. then performs the operation required by the instruction, which might be arithmetic or logical operation. As each instructions are performed, the results are either temporary saved by the C.P.U. or are stored in memory.
5. The processing Cycle (retrieves instructions, decode and execute instructions, save results) is repeated until all the programme instructions have been carried out by the C.P.U. The final results are then either stored in main memory, or are sent to an output device such as a printer.
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