Multiple choice technology mainframe

4.Which mode of opening is required when REWRITE is used?

  1. UPDATE

  2. OPEN

  3. I-O

  4. INPUT
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C Correct answer
Explanation

I-O (Input-Output) mode is required when using REWRITE in COBOL file operations. REWRITE modifies an existing record in a file, which requires the file to be opened in I-O mode to allow both reading and writing. UPDATE is not a valid file open mode in COBOL, OPEN is a verb not a mode, and INPUT mode only allows reading.

AI explanation

COBOL's REWRITE statement updates an existing record in a file that has already been read, and this requires the file to be opened in I-O mode (Input-Output) so both reading and rewriting are permitted on the same open. OPEN and INPUT modes don't allow rewriting records, and UPDATE isn't a valid COBOL open mode keyword (the valid modes are INPUT, OUTPUT, I-O, and EXTEND). Hence I-O is the only correct choice.

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