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2-4-4 File Processing
File processing is an algorithm that uses files where records are stored. In the basic file processing, a series of flows like “reading records from the input file”, “processing (e.g., calculation process, editing process) input records”, and “writing records in the output file” is repeated until no record is left in the input file.
- • Sorting process/merging process
Sorting process/merging process is a process of sorting records recorded in a file and merging two sorted files into one file without disturbing the sorting order. One of the methods implements this with internal processing after the contents of records are sorted in an array, and another method uses a service program or instructions (e.g., SORT instruction, MERGE instruction) of programming languages. - • Control break process
When the records of a file are sorted with key items, the control break process handles the records as one group until the value of the key items change. It is used in the process (i.e., group total process) that determines the total for each group.
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Original chapter exercises
Original chapter exercises →New FE Textbook Vol.1 · IT Fundamentals · First Edition, April 2015