a. Can the OPTIONAL clause in COBOL only be coded for input
files?
b. If it is coded for files opened in OUTPUT, I-O or EXTEND
mode, will it give a compilation error?
c. If there are no compilation errors and if such files are
not coded in the JCL, will the OPEN statement run fine when
these files are opened?
d. How will a WRITE statement work for the above files?
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Answer Posted / kb
An OPTIONAL file is being opened as EXTEND or I-O. Optional
files are files that are not necessarily present each time
the program is run. You can define files opened in INPUT,
I-O, or EXTEND mode as optional by using the SELECT OPTIONAL
phrase in the FILE-CONTROL paragraph.
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