作为作业的一部分，我需要创建一个“运送”程序，该程序会检查某个字段，该字段指示项目的发货日期。在对其余数据进行排序时，将省略任何日期超过6个月的记录。
问题是无论我尝试什么，我都会得到不好的结果。我认为EVALUATE声明是最好的路线，但我似乎无法做到正确。这就是我的失败：
DATA DIVISION.
FILE SECTION.
COPY ORDERS-FILE-NEW-IN.COP.
FD ORDERS-FILE-NEW-IN.
01 ORDERS-RECORD-NEW-IN.
05 PART-NUMBER-N-IN PIC X(8).
05 QUANTITY-N-IN PIC 9(4).
05 REQUEST-DATE-N-IN.
10 REQUEST-YEAR-N-IN PIC X(4).
10 REQUEST-MONTH-N-IN PIC XX.
10 REQUEST-DAY-N-IN PIC XX.
05 CUST-NUMBER-N-IN PIC X(5).
05 CUST-ORDER-NUMBER-N-IN PIC X(10).
05 STOCK-AVAILABLE-N-IN PIC X.
COPY ORDERS-FILE-PRIOR-IN.COP.
FD ORDERS-FILE-PRIOR-IN.
01 ORDERS-RECORD-PRIOR-IN.
05 PART-NUMBER-P-IN PIC X(8).
05 QUANTITY-P-IN PIC 9(4).
05 REQUEST-DATE-P-IN.
10 REQUEST-YEAR-P-IN PIC X(4).
10 REQUEST-MONTH-P-IN PIC XX.
10 REQUEST-DAY-P-IN PIC XX.
05 CUST-NUMBER-P-IN PIC X(5).
05 CUST-ORDER-NUMBER-P-IN PIC X(10).
05 STOCK-AVAILABLE-P-IN PIC X.
COPY ORDERS-FILE-SORT.COP.
SD ORDERS-FILE-SORT.
01 ORDERS-RECORD-SORT.
05 PART-NUMBER-S PIC X(8).
05 QUANTITY-S PIC 9(4).
05 REQUEST-DATE-S.
10 REQUEST-YEAR-S PIC X(4).
10 REQUEST-MONTH-S PIC XX.
10 REQUEST-DAY-S PIC XX.
05 CUST-NUMBER-S PIC X(5).
05 CUST-ORDER-NUMBER-S PIC X(10).
05 STOCK-AVAILABLE-S PIC X.
FD ORDERS-FILE-OUT.
01 ORDERS-RECORD-OUT PIC X(80).
WORKING-STORAGE SECTION.
01 ARE-THERE-MORE-RECORDS PIC X(3) VALUE 'YES'.
01 REPORT-START PIC X VALUE 'Y'.
01 LINE-COUNT PIC 99 VALUE ZEROS.
01 LINE-JUMP PIC X VALUE 'Y'.
01 PAGE-NUMBER PIC 99 VALUE ZEROS.
01 MONTH-TOTAL PIC 99 VALUE ZEROS.
01 YEAR-TOTAL PIC 99 VALUE ZEROS.
01 YEAR-CHECK PIC 99 VALUE ZEROS.
01 SPACE-LINE PIC X VALUE SPACE.
01 WS-DATE.
05 RUN-MONTH PIC XX.
05 RUN-DAY PIC XX.
05 RUN-YEAR PIC XX.
01 HEADING-LINE-1.
05 PIC X(15) VALUE SPACES.
05 PIC X(43)
VALUE 'OPEN ORDERS REPORT - NEXT SIX MONTHS'.
05 HL-1-DATE.
10 MONTH-1 PIC 99.
10 PIC X VALUE '/'.
10 DAY-1 PIC 99.
10 PIC X VALUE '/'.
10 YEAR-1 PIC 99.
05 PIC X(3) VALUE SPACES.
05 PAGE-1 PIC X(5) VALUE 'PAGE'.
05 NUMBER-PAGE PIC Z9.
01 HEADING-LINE-2.
05 PIC X(14)
VALUE 'REQUEST DATE'.
05 PIC X(12)
VALUE 'CUSTOMER #'.
05 PIC X(16)
VALUE 'CUSTOMER ORD #'.
05 PIC X(10)
VALUE 'PART #'.
05 PIC X(11)
VALUE 'QUANTITY'.
05 PIC X(8)
VALUE 'AVAIL'.
05 PIC X(5)
VALUE 'SHIP?'.
01 DETAIL-LINE.
05 REQUEST-DATE.
10 REQUEST-MONTH PIC XX.
10 PIC X VALUE '/'.
10 REQUEST-DAY PIC XX.
10 PIC X VALUE '/'.
10 REQUEST-YEAR PIC X(4).
05 PIC X(4) VALUE SPACES.
05 CUST-NUMBER PIC X(5).
05 PIC X(7) VALUE SPACES.
05 CUST-ORDER-NUMBER PIC X(10).
05 PIC X(6) VALUE SPACES.
05 PART-NUMBER PIC X(8).
05 PIC X(5) VALUE SPACES.
05 QUANTITY PIC Z,ZZZ.
05 PIC X(3) VALUE SPACES.
05 STOCK-AVAILABLE PIC X(3).
05 PIC X(5) VALUE SPACES.
05 SHIP-MESSAGE PIC X(4).
PROCEDURE DIVISION.
100-MAIN.
SORT ORDERS-FILE-SORT
ON ASCENDING KEY REQUEST-DATE-S
ON ASCENDING KEY CUST-NUMBER-S
ON ASCENDING KEY CUST-ORDER-NUMBER-S
ON ASCENDING KEY PART-NUMBER-S
INPUT PROCEDURE 200-SORT-SELECTION
OUTPUT PROCEDURE 300-FILE-START
STOP RUN.
200-SORT-SELECTION.
OPEN INPUT ORDERS-FILE-NEW-IN
ORDERS-FILE-PRIOR-IN
ACCEPT WS-DATE FROM DATE
MOVE RUN-MONTH TO MONTH-1
MOVE RUN-DAY TO DAY-1
MOVE RUN-YEAR TO YEAR-1
PERFORM UNTIL ARE-THERE-MORE-RECORDS = 'NO '
READ ORDERS-FILE-PRIOR-IN
AT END
MOVE 'NO' TO ARE-THERE-MORE-RECORDS
NOT AT END
PERFORM 210-SORT-ADD-PRIOR
END-READ
END-PERFORM
MOVE 'YES' TO ARE-THERE-MORE-RECORDS
PERFORM UNTIL ARE-THERE-MORE-RECORDS = 'NO '
READ ORDERS-FILE-NEW-IN
AT END
MOVE 'NO' TO ARE-THERE-MORE-RECORDS
NOT AT END
PERFORM 220-SORT-ADD-NEW
END-READ
END-PERFORM
MOVE 'YES' TO ARE-THERE-MORE-RECORDS
CLOSE ORDERS-FILE-NEW-IN
ORDERS-FILE-PRIOR-IN.
210-SORT-ADD-PRIOR.
MOVE ORDERS-RECORD-PRIOR-IN TO ORDERS-RECORD-SORT
MOVE MONTH-1 TO MONTH-TOTAL
MOVE YEAR-1 TO YEAR-TOTAL
MOVE REQUEST-YEAR-P-IN TO YEAR-CHECK
ADD 6 TO MONTH-TOTAL
IF MONTH-TOTAL > 12
SUBTRACT 12 FROM MONTH-TOTAL
END-IF
EVALUATE REQUEST-MONTH-P-IN
WHEN 01 IF MONTH-TOTAL = 1 OR
(MONTH-TOTAL > 6 AND < 13)
IF YEAR-CHECK - YEAR-1 = 0 OR 1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 02 IF (MONTH-TOTAL = 1 OR 2) OR
(MONTH-TOTAL > 7 AND < 13)
IF YEAR-CHECK - YEAR-1 = 0 OR 1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 03 IF (MONTH-TOTAL > 0 AND < 4) OR
(MONTH-TOTAL > 8 AND < 13)
IF YEAR-CHECK - YEAR-1 = 0 OR 1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 04 IF (MONTH-TOTAL > 0 AND < 5) OR
(MONTH-TOTAL > 9 AND < 13)
IF YEAR-CHECK - YEAR-1 = 0 OR 1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 05 IF (MONTH-TOTAL > 0 AND < 6) OR
(MONTH-TOTAL = 11 OR 12)
IF YEAR-CHECK - YEAR-1 = 0 OR 1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 06 IF (MONTH-TOTAL > 0 AND < 7) OR
MONTH-TOTAL = 12
IF YEAR-CHECK - YEAR-1 = 0 OR 1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 07 IF MONTH-TOTAL > 1 AND < 8
IF YEAR-CHECK = YEAR-1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 08 IF MONTH-TOTAL > 2 AND < 9
IF YEAR-CHECK = YEAR-1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 09 IF MONTH-TOTAL > 3 AND < 10
IF YEAR-CHECK = YEAR-1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 10 IF MONTH-TOTAL > 4 AND < 11
IF YEAR-CHECK = YEAR-1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 11 IF MONTH-TOTAL > 5 AND < 12
IF YEAR-CHECK = YEAR-1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
WHEN 12 IF MONTH-TOTAL > 6 AND < 13
IF YEAR-CHECK = YEAR-1
RELEASE ORDERS-RECORD-SORT
END-IF
END-IF
END-EVALUATE.
答案 0 :(得分：2)
作为程序员，COBOL或其他方式，您应该学习的第一件事就是确定您的要求是什么。您的作业要求比较两个日期并执行某些操作（如果一个是6个月或更少）。究竟6个月是什么意思？它会是：183天;它是月份数加6，在这种情况下，2011-01-31和2011-07-01的日期相隔6个月 - 但比183天的替代定义短33天;其他定义也是可能的。日期和日期算术尤其令人困惑。
接下来，请注意不同的日期格式：YYMMDD;年月日; MMDDYYYY; DDMYYYYY可能更多。 ACCEPT WS-DATE FROM DATE语句可能会为您提供与您期望的日期格式不同的日期格式（编译时选项和/或编译器安装默认值可能会影响格式）。通常，在ACCEPT WS-YYYYMMDD FROM DATE YYYYMMDD中请求明确的日期格式是更好的形式。您的计划中的一个问题与此有关。你混合2到4位数，如：
MOVE REQUEST-YEAR-P-IN TO YEAR-CHECK
将4位数年份移至两位数年份。你认为那被截断了什么？这反过来会弄乱你的整个EVALUATE声明（我建议不要使用你在这个程序中的方式）。
接下来我认为你最好利用日期在输入文件中呈现给你的方式。它们采用YYYYMMDD格式。您需要做的就是从当前日期开始计算未来6个月的日期，并将其直接与输入文件中的日期进行比较。如果输入日期在数值上小于计算日期，请保留记录。
尝试类似：
10 WS-YYYYMMDD.
15 WS-YYYY PIC 9(4).
15 WS-MM PIC 9(2).
15 WS-DD PIC 9(2).
100-MAIN.
*
* Calculate a reference date 6 months into the future.
*
ACCEPT WS-YYYYMMDD FROM DATE YYYYMMDD
COMPUTE WS-MM = WS-MM + 6 END-COMPUTE
IF WS-MM > 12
COMPUTE WS-MM = WS-MM - 12 END-COMPUTE
COMPUTE WS-YYYY = WS-YYYY + 1 END-COMPUTE
END-IF
....
210-SORT-ADD-PRIOR.
IF REQUEST-DATE-P-IN < WS-YYYYMMDD
MOVE ORDERS-RECORD-PRIOR-IN TO ORDERS-RECORD-SORT
RELEASE ORDERS-RECORD-SORT
END-IF
.
或者这些方面的东西......但摆脱那个巨大的EVALUATE。
答案 1 :(得分：1)
如果您想知道日期是否提前6个月，我认为只计算几个月
更容易比较
Year-today * 12 + month-Today + 6
使用
Year-Shipping * 12 + month-Shipping
你已经完成了。
答案 2 :(得分：1)
我只能假设这对于帮助完成作业来说太晚了，但是使用内在的 FUNCTION INTEGER-OF-DATE 可能会比较未来日期的比较。之后你只需要整数比较。假设日期在16010101和99991231范围内，你应该很高兴（Gregorian）。
答案 3 :(得分：0)
IF MONTH-TOTAL > 12
SUBTRACT 12 FROM MONTH-TOTAL
END-IF
也许你需要在IF中添加1年？ 我甚至不会尝试在COBOL
中编写它答案 4 :(得分：0)
我会在程序开始时建议
计算未来日期：
Add 6 to month
if month > 12
Sub 12 from month
Add 1 to year
end-if
这比评估
简单得多