我在使用 Cobol 时遇到问题 [关闭]

Question

 IDENTIFICATION DIVISION.
 PROGRAM-ID. MP4-5.
 ENVIRONMENT DIVISION.
 DATA DIVISION.
 WORKING-STORAGE SECTION.

 01 SEAT-DESCRIPTION.
    03 FILLER PIC X(50) VALUE "01   DRIVER".
    03 FILLER PIC X(50) VALUE "02   DRIVER'S ASST".
    03 FILLER PIC X(50) VALUE "03".
    03 FILLER PIC X(50) VALUE "04".
    03 FILLER PIC X(50) VALUE "05".
    03 FILLER PIC X(50) VALUE "06".
    03 FILLER PIC X(50) VALUE "07".
    03 FILLER PIC X(50) VALUE "08".
    03 FILLER PIC X(50) VALUE "09".
    03 FILLER PIC X(50) VALUE "10".
    03 FILLER PIC X(50) VALUE "11".
    03 FILLER PIC X(50) VALUE "12".
    03 FILLER PIC X(50) VALUE "13".
    03 FILLER PIC X(50) VALUE "14".
    03 FILLER PIC X(50) VALUE "15".

 01 MAIN-MENU   PIC X.
   88 RESERVATION VALUE "R".
   88 VIEW-RESERVATION VALUE "V".
   88 CANCEL-RESERVATION VALUE "D".
   88 EXIT-PROC VALUE "E".

 01 DECISION PIC X.
   88 YES VALUE "Y".
   88 NAY VALUE "N".   

 01 SEAT-NUM PIC 9(2).

 01 CUST-NAME PIC X(18).

 01 CUST-CNTCT PIC 9(11).

 01 CHOICE PIC X.

PROCEDURE DIVISION.
MAIN-ROUTINE.

 DISPLAY "        ABC TRANSPORT COMPANY".
 DISPLAY "__________________________________________".
 DISPLAY "     [R] ADD RESERVATION/S ".
 DISPLAY "     [V] VIEW RESERVATION/S ".
 DISPLAY "     [D] CANCEL RESERVATION/S ".
 DISPLAY "     [E] EXIT".
 DISPLAY "         ENTER CHOICE: " WITH NO ADVANCING.

 ACCEPT MAIN-MENU.

 PERFORM I-CHAIN.

I-CHAIN.
 IF RESERVATION
    GO TO RESERVE-PROC
 ELSE IF VIEW-RESERVATION
    GO TO VRESERVE-PROC
 ELSE IF CANCEL-RESERVATION
    GO TO CRESERVE-PROC
 ELSE IF EXIT-PROC
    GO TO END-PGM
 ELSE
    DISPLAY "INVALID OPTION"

 GO TO MAIN-ROUTINE.


RESERVE-PROC.
 DISPLAY "RESERVE SEAT #:   "WITH NO ADVANCING.
 ACCEPT SEAT-NUM.

 IF SEAT-NUM IS NUMERIC
      IF SEAT-NUM >2 AND SEAT-NUM <16
      GO TO CONT-RES
      ELSE
             DISPLAY "INVALID OPTION"
             PERFORM RESERVE-PROC
 ELSE 
    DISPLAY "ENTER A NUMERIC VALUE"
    GO TO RESERVE-PROC.

CONT-RES.
 DISPLAY "CUSTOMER NAME :     "WITH NO ADVANCING.
 ACCEPT CUST-NAME.

 MOVE CUST-NAME TO SEAT-NUM.
 DISPLAY "CUSTOMER CONTACT #: "WITH NO ADVANCING.
 ACCEPT CUST-CNTCT.

 MOVE CUST-CNTCT TO SEAT-NUM.
 GO TO RESER-CONT.

RESER-CONT.
 DISPLAY "RESERVE MORE? [Y/N]? "WITH NO ADVANCING.
 ACCEPT DECISION.
 IF YES
     PERFORM RESERVE-PROC
 ELSE IF NAY
     PERFORM MAIN-ROUTINE
 ELSE
     DISPLAY "INVALID OPTION"
     PERFORM RESER-CONT.

VRESERVE-PROC.
 DISPLAY "        ABC TRANSPORT COMPANY".
 DISPLAY "           RESERVATION LIST".
 DISPLAY "__________________________________________".
 DISPLAY " "SEAT-DESCRIPTION.

CRESERVE-PROC.
 DISPLAY "        ABC TRANSPORT COMPANY".
 DISPLAY "         CANCEL RESERVATION".
 DISPLAY "__________________________________________".

END-PGM.
 STOP RUN.

我知道代码还不完整，但我可以在如何使用表格方面提供一些帮助，因为 我很难显示要添加到变量 SEAT-NUM 中的内容，任何删除字符串 1 乘 1 的提示都会有所帮助

Answer 1

开始你需要类似的东西

01 SEAT-DESCRIPTION-REDEF REDEFINES SEAT-DESCRIPTION.
   03 SEAT-NUMBER-DATA OCCURS 15.
      05 SEAT-NUMBER-TEXT   PIC X(02).
      05 FILLER             PIC X(04).
      05 SEAT-FILLED-BY     PIC X(44).

您现在可以为SEAT-FILLED-BY(SEAT-NUM) 分配一个值来为座位分配一个名称。

不清楚你在用CUST-CNTCT做什么，但做了一个小调整：

01 SEAT-DESCRIPTION-REDEF REDEFINES SEAT-DESCRIPTION.
   03 SEAT-NUMBER-DATA OCCURS 15.
      05 SEAT-NUMBER-TEXT   PIC X(02).
      05 FILLER             PIC X(04).
      05 SEAT-FILLED-BY     PIC X(32).
      05 FILLER             PIC X(01).
      05 SEAT-CONTACT       PIC X(11).

现在您可以MOVE CUST-CNTCT TO SEAT-CONTACT(SEAT-NUM).，这可能与您想要做的很接近。

现在是一个关于结构的小广告。

避免转至。

从来没有必要使用 GO TO。总是

PERFORM paragraphname [UNTIL condition].

在你习惯它之前，这不是一门简单的学科——当你做意大利面条代码的噩梦时，你就会习惯它； GO TO 无处不在，PERFORM me 调用递归代码。

如果有人提到PERFORM THROUGH，只需微笑和点头，然后忽略他们要说的一切。他们是邪恶的缩影，因为他们提倡依赖布局的代码。

Answer 2

我们在我们的商店中使用THROUGH，但有一个目的。我们用一个名字来标记每个段落，并在最后用“-”退出这个名字结束那个段落。

然后当我们调用该段落时，我们使用语法调用它

"PERFORM L2-SUB-PARAGRAPH THROUGH L2-SUB-PARAPGRAPH-EXIT.

这使代码更具面向对象的外观，并使段落更加模块化。

或者如果想循环一个段落，你可以这样编码：

`PERFORM -L2-LOOPING-PARA' 
     'THROUGH L2-LOOPING-PARA-EXIT'
         'VARYING INDEX1 FROM 1 BY 1.... `