write algo for cobol program whichuse three flat file to
extract some specific information 8 marks mainframe
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Answer Posted / Rishikant
Here is an example algorithm for a COBOL program that extracts specific information from three flat files:
1. Read the input control file to determine the sequence of operations (e.g., which files to read, what data to extract).
2. Open each of the three flat files (FILE1, FILE2, and FILE3) for reading using OPEN-IN statements.
3. Set appropriate variables for storing extracted data.
4. Process each record in FILE1 and read the required data from the other two files based on a common key or identifier. Store the combined information into the output format.
5. Write the processed records to an output file using WRITE-OUT statements.
6. Close each of the three files using CLOSE statements.
7. Stop when end-of-file is reached for any of the input files.
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