将两个整数相加会给cobol带来不必要的结果

我正在将文件读入表中，请注意第一行不是表的一部分。

1000
MS 1 - Join Grps    Group Project       5             5             
Four Programs       Programming         15            9             
Quiz 1              Quizzes             10            7             
FORTRAN             Programming         25            18            
Quiz 2              Quizzes             10            9             
HW 1 - Looplang     Homework            20            15            

在代码中，表表示如下：

01     GRADES.
05         GRADE OCCURS 1 TO 100 TIMES DEPENDING ON RECORD-COUNT INDEXED BY J.
10            ASSIGNMENT-NAME   PIC X(20).
10            CATEGORY          PIC X(20).
10            POINTS-POSSIBLE   PIC 9(14).
10            POINTS-EARNED     PIC 9(14).

我还有其他一些累加器变量，这些变量稍后将用于计算总和/百分比。

01     RECORD-COUNT             PIC 9(8) VALUE 0.
01     TOTAL-EARNED-POINTS      PIC 9(14).
01     TOTAL-POSSIBLE-POINTS    PIC 9(14) VALUE 0.

我的问题是，当我逐行阅读记录时，我想执行以下操作：

ADD POINTS-EARNED(RECORD-COUNT) TO TOTAL-EARNED-POINTS

RECORD-COUNT迭代中的当前位置在哪里。我希望TOTAL-EARNED-POINTS第一次迭代后的值简单地是5，对吗？但是，当我DISPLAY输入TOTAL-EARNED-POINTS的值时，控制台将读取：

50000000000000

这是50万亿吗？还是数字5的有趣外观？我该怎么写，以便我可以用它做适当的数学以打印出适当的成绩报告？

编辑：我知道可能有更好的方法来编写此程序，但是在尝试编写此程序之前，我从未使用过cobol，而且我可能不会再使用它，或者至少很长时间都不会使用它。这是一堂课，只要我能正确打印输出，我就很好。到目前为止的完整代码：

IDENTIFICATION DIVISION.
PROGRAM-ID. GRADEREPORT.
AUTHOR. JORDAN RENAUD.
DATE-WRITTEN. 09/18/2020.

ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
       SELECT GRADES-FILE ASSIGN TO "bill"
           ORGANIZATION IS LINE SEQUENTIAL
           ACCESS IS SEQUENTIAL.

DATA DIVISION.
FILE SECTION.
FD GRADES-FILE.
01     INPUT-TOTAL-POINTS       PIC 9(4).
01     INPUT-GRADES.
05         INPUT-GRADE OCCURS 1 to 100 TIMES DEPENDING ON RECORD-COUNT INDEXED BY I.
10            INPUT-ASSIGNMENT-NAME   PIC X(20).
10            INPUT-CATEGORY          PIC X(20).
10            INPUT-POINTS-POSSIBLE   PIC 9(14).
10            INPUT-POINTS-EARNED     PIC 9(14).

WORKING-STORAGE SECTION.
77     GRADES-FILE-EOF          PIC 9.
01     RECORD-COUNT             PIC 9(8) VALUE 0.
01     TOTAL-EARNED-POINTS      PIC 9(4) VALUE ZERO.
01     TOTAL-POSSIBLE-POINTS    PIC 9(14) VALUE 5.
01     K                        PIC 9(14) VALUE 1.
01     TMP                      PIC 9(14).
01     CURRENT-CATEGORY         PIC X(20).
01     CATEGORY-WEIGHT          PIC X(3).
01     LAST-CATEGORY            PIC X(20).
01     TOTAL-POINTS             PIC 9(4).
01     GRADES.
05         GRADE OCCURS 1 TO 100 TIMES DEPENDING ON RECORD-COUNT INDEXED BY J.
10            ASSIGNMENT-NAME   PIC X(20).
10            CATEGORY          PIC X(20).
10            POINTS-POSSIBLE   PIC 9(14).
10            POINTS-EARNED     PIC 9(14).

PROCEDURE DIVISION.
       OPEN INPUT GRADES-FILE.
       READ GRADES-FILE INTO TOTAL-POINTS.
       DISPLAY TOTAL-EARNED-POINTS
       PERFORM UNTIL GRADES-FILE-EOF = 1
           READ GRADES-FILE
              AT END SET
              GRADES-FILE-EOF TO 1
              NOT AT END
                 ADD 1 TO RECORD-COUNT
                 MOVE INPUT-GRADES TO GRADE(RECORD-COUNT)
                 SET TOTAL-EARNED-POINTS UP BY POINTS-EARNED(RECORD-COUNT)
                 DISPLAY TOTAL-EARNED-POINTS
           END-READ
       END-PERFORM.
       CLOSE GRADES-FILE.
       DISPLAY TOTAL-EARNED-POINTS.
       SORT GRADE ASCENDING CATEGORY.
       MOVE CATEGORY(1) TO LAST-CATEGORY.
       PERFORM RECORD-COUNT TIMES
           MOVE CATEGORY(K) TO CURRENT-CATEGORY
           IF CURRENT-CATEGORY = LAST-CATEGORY THEN
              DISPLAY "SAME CATEGORY"
           ELSE
              DISPLAY "NEW CATEGORY"
              MOVE LAST-CATEGORY TO CURRENT-CATEGORY
           END-IF
           SET K UP BY 1
       END-PERFORM
       DISPLAY GRADES.
       STOP RUN.

编辑2：在执行给定的答案以将输入从文件转换为数字形式后，表的第一行就可以了，但是从那时起，它都是空白值。这是READ块的新代码，我不确定是否有一种更有效的方式来读取和转换组字段中的特定字段，但这就是我认为应该这样做的方式。

PERFORM UNTIL GRADES-FILE-EOF = 1
           READ GRADES-FILE
              AT END SET
              GRADES-FILE-EOF TO 1
              NOT AT END
                 ADD 1 TO RECORD-COUNT

                 MOVE INPUT-ASSIGNMENT-NAME(RECORD-COUNT) TO ASSIGNMENT-NAME(RECORD-COUNT)
                 DISPLAY INPUT-ASSIGNMENT-NAME(RECORD-COUNT)
                 DISPLAY ASSIGNMENT-NAME(RECORD-COUNT)

                 MOVE INPUT-CATEGORY(RECORD-COUNT) TO CATEGORY(RECORD-COUNT)
                 DISPLAY INPUT-CATEGORY(RECORD-COUNT)
                 DISPLAY CATEGORY(RECORD-COUNT)

                 MOVE FUNCTION NUMVAL (INPUT-POINTS-POSSIBLE(RECORD-COUNT)) TO POINTS-POSSIBLE(RECORD-COUNT)
                 DISPLAY INPUT-POINTS-POSSIBLE(RECORD-COUNT)
                 DISPLAY POINTS-POSSIBLE(RECORD-COUNT)

                 MOVE FUNCTION NUMVAL (INPUT-POINTS-EARNED(RECORD-COUNT)) TO POINTS-EARNED(RECORD-COUNT)
                 DISPLAY INPUT-POINTS-EARNED(RECORD-COUNT)
                 DISPLAY POINTS-EARNED(RECORD-COUNT)

                 COMPUTE TOTAL-EARNED-POINTS = TOTAL-EARNED-POINTS + POINTS-EARNED(RECORD-COUNT)
                 DISPLAY TOTAL-EARNED-POINTS
           END-READ
       END-PERFORM.