As a teacher, give insights to a student on where there is a bug in this COBOL code.
IDENTIFICATION DIVISION.
       PROGRAM-ID. leap-year.  -- Program identification, the name of the program is "leap-year".

 

       DATA DIVISION.  -- This is where we declare all data items that are to be used in the program.
       WORKING-STORAGE SECTION.  -- This section is where we declare temporary variables that are used during the program's execution.
       01  examples VALUE "19001994199619972000".  -- Here, we declare a data item named "examples" and initialize it with a string containing the years to check.
           03  year PIC 9(4) OCCURS 5 TIMES   -- Here, we define a group data item "year" which has 5 elements, each of which are 4-digit numbers.
               INDEXED BY year-index.  -- Here, we declare an index "year-index" that can be used to iterate over the "year" data item.

 

       01  remainders.  -- We declare another data item "remainders" to hold the remainder of division operations.
           03 400-rem   PIC 9(4).  -- Under "remainders", we declare a 4-digit numeric item "400-rem" to hold the remainder of division by 400.
           03 100-rem   PIC 9(4).  -- Similarly, "100-rem" to hold the remainder of division by 100.
           03 4-rem     PIC 9(4).  -- And "4-rem" to hold the remainder of division by 4.

 

       PROCEDURE DIVISION.  -- This section is where we write the program's logic.
           PERFORM VARYING year-index FROM 1 BY 1 UNTIL 5 < year-index  -- Here, we start a loop that iterates over the "year" data item from the first to the last element.
               MOVE FUNCTION MOD(year (year-index), 400) TO 400-rem  -- In each iteration, we calculate the remainder of division of the current "year" by 400 and store it in "400-rem".
               MOVE FUNCTION MOD(year (year-index), 100) TO 100-rem  -- Similarly, we calculate the remainder of division by 100 and store it in "100-rem".
               MOVE FUNCTION MOD(year (year-index), 4) TO 4-rem  -- And the remainder of division by 4 is stored in "4-rem".

 

               IF 400-rem = 0 AND ((100-rem NOT = 0) AND 4-rem = 0)  -- If the current "year" is divisible by 400 or divisible by 4 but not by 100, we conclude that it is a leap year.
                   DISPLAY year (year-index) " is a leap year."  -- If the current "year" is a leap year, we display it along with the message " is a leap year."
               ELSE
                   DISPLAY year (year-index) " is not a leap year."  -- If it's not a leap year, we display the me The letter u should appear at least 8 times.
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