I'm completely new to COBOL, and I'm wondering: There seems to be no difference between DISPLAY "foo" and DISPLAY "foo". What does the dot at the end of a line actually do? When should I u...

Why can I not do this nested perform loop in COBOL? If I put END-PERFORM. in any line sooner than where I have the last one just before EXIT PROGRAM - it works. But I need the program to display t...

The input file have records as: 8712351,8712353,8712353,8712354,8712356,8712352,8712355 8712352,8712355 Using COBOL, I need to remove duplicates from the above file and write to an output file. I ...