cobol - 当列与 COBOL REPORT WRITER 模块中的 SUM 子句一起使用时，您能否引用 DECLARATIVES 部分中的列？

Question

除了特定平台和编译器之外，假设您使用报表编写器模块在 COBOL 程序中定义了它:

01 CF-MM TYPE CONTROL FOOTING WS-MM.
             02 LINE PLUS 1.
                03 COLUMN 1             VALUE "* CF MONTH: ".
                03 COLUMN PLUS 1        PIC 99 SOURCE WS-MM.
                03 S-MM COLUMN PLUS 5   PIC S9(4)V99 SUM WS-TUTION-PAY. 
                03 VAL-NN COLUMN PLUS 5 PIC S9(4)V99 SOURCE S-MM.
      <...>
       PROCEDURE DIVISION.
       DECLARATIVES.  
           
        SEC2 SECTION.
            USE BEFORE REPORTING 
            CF-MM.
            DISPLAY "SUM MM LEVEL:" S-MM   
           .

此外，假设程序报告了 3 行，其中 SUM WS-TUTION-PAY 结果为 126。

SEC2 SECTION 中显示 S-MM 值的语句产生的值是多少？我想它应该是 126，但我显示的是零。这可能是因为值 126 尚未移至 S-MM，但我不确定。

在 S-MM 的声明部分“应该”显示的值是什么

Answer 1

问: 当列与 COBOL REPORT WRITER 模块中的 SUM 子句一起使用时，您能否引用 DECLARATIVES 部分中的列？

03 S-MM COLUMN PLUS 5   PIC S9(4)V99 SUM WS-TUTION-PAY. 

S-MM 是entry-name 子句的data-name 格式。引用自 2002 COBOL 标准，报告组描述条目，13.13.2 语​​法规则:

7) The data-name format of the entry-name clause shall be specified when the data-name is referenced in a GENERATE statement, a USE BEFORE REPORTING statement, as a qualifier for a SUM counter, in the UPON phrase of the SUM clause, or as an operand in a SUM clause. The data-name shall not be referenced in any other way.

鉴于 S-MM 符合条件，它可能被引用为“作为 SUM 计数器的限定符”。

[COBOL 74 和 85 标准指出，“Data-name-1 是可选的，但可以在任何条目中指定。但是，Data-name-1 只能在条目定义求和计数器时引用。”]

我用于以下代码的编译器是 Micro Focus COBOL 85。

---

代码:

   program-id. rw-test.
   environment division.
   input-output section.
       select report-file assign "rpt.txt"
           organization line sequential.
   data division.
   fd report-file
       report is report-1.
   working-storage section.
   01 n comp pic 99 value 0.
   01 test-table.
     02 test-data.
       03 pic 9999 value 1001.
       03 pic 9999 value 1002.
       03 pic 9999 value 1003.
       03 pic 9999 value 2004.
       03 pic 9999 value 2005.
       03 pic 9999 value 2006.
     02 test-entry redefines test-data pic 9999 occurs 6.
   01 report-entry.
       03 test-group pic 9.
       03 test-value pic 999.
   report section.
   rd report-1
    control is test-group.
   01 rw-detail type de.
     02 line plus 1.
       03 grp column 1 pic 9 source test-group.
       03 val column 4 pic zz9 source test-value.
   01 rw-foot type cf test-group.
     02 line plus 1.
       03 column 1 pic x(6) value "-  ---".
     02 line plus 1.
       03 column 1 pic 9 source test-group.
       03 s-mm column 4 pic zz9        *> s.mm defined
           sum test-value
           reset test-group.
     02 line plus 1 pic x value space.
   procedure division.
   declaratives.
   decl-rpt section.
       use before reporting rw-foot.
           display s-mm.               *> s.mm referenced
   end declaratives.
   main-line section.
       open output report-file.
       initiate report-1
       perform varying n from 1 by 1
       until n > 6
           move test-entry (n) to report-entry
           generate rw-detail
       end-perform
       terminate report-1
       close report-file
       stop run.
   end program rw-test.

报告:

1    1
1    2
1    3
-  ---
1    6

2    4
2    5
2    6
-  ---
2   15

显示:

006
015