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Suppose, file A has 100 records and file B has 500 records. We
want to write records common to both A and B into file C and
records which are present only in either A or B into another file D.
What should be the logic of Cobol program to achieve this?
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Answer Posted / karan
If we do not want to go with cobol then it can be easily
done with SORT, ICETOOL( Splice option) which i feel is
faster and simpler instead of writing a compare program.
If there is a compultion to use a cobol pgm then soln will
be -
PERFORM untill (EOF A and EOF B)
if f1 = f2
move file1-rec to file3-rec. write file3-rec
read f1 & f2.
if f1 < f2
move file1-rec to file4-rec. write file4-rec.
read f1.
if f1 > f2
move file2-rec to file4-rec. write file4-rec
read f2.
END PERFORM
IF EOF A and not EOF B
PERFORM until EOF B
move move file2-rec to file4-rec.
write file4-rec
read f2.
END PERFORM
ElSE
IF EOF B and not EOF A
PERFORM until EOF A
move move file1-rec to file4-rec.
write file4-rec
read f1.
END PERFORM
END
note: files should be in sorted order ASC before program
runs.
This is a generic solution to al such compare programs.
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