The input-output section of the environment division contains two paragraphs:
The exact contents of the input-output section depend on the file organization and access methods used. See ORGANIZATION clause and ACCESS MODE clause.
The keyword FILE-CONTROL and the period can be omitted if no file-control-paragraph is specified and there are no files defined in the program.
Must begin in Area B with a SELECT clause. It must end with a separator period. See FILE-CONTROL paragraph.
file-control-paragraph can be omitted if there are no files defined in the program, even if the FILE-CONTROL keyword is specified.