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Merge pull request #153 from klausmelcher/issues-contributions
Contribution to Issue #112
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‎COBOL Programming Course #1 - Getting Started/COBOL Programming Course #1 - Getting Started.md‎

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- CBL0002J
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- CBL0003J
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- CBL0033J
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![](Images/image133.png)
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- RUN:PRTLINE(103) is the COBOL program execution output (if correction is successful)
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10. Submit job, JCL(CBL0003J), using the DATA SET section.
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10. Submit job, JCL(CBL0033J), using the DATA SET section.
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11. View CBL0003J ABENDU4038 output, using the JOBS section:
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11. View CBL0033J ABENDU4038 output, using the JOBS section:
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- View the IGZ00355 abend message in RUN:SYSOUT(104) from the COBOL program execution output.
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12. Fix this error by editing JCL(CBL0003J):
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12. Fix this error by editing JCL(CBL0033J):
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- Determine the DDNAME needed, but missing or misspelled.
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- Correct it within the code and save
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13. Re-submit job, JCL(CBL0003J), using the DATA SET section.
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13. Re-submit job, JCL(CBL0033J), using the DATA SET section.
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14. View CBL0003J output using the JOBS section, your output should look like Figure 12.
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14. View CBL0033J output using the JOBS section, your output should look like Figure 12.
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- RUN:PRTLINE - COBOL program execution output (if correction is successful)
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![](Images/image138.png)
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*Figure 12. RUN:PRTLINE(103) for JCL(CBL0003J)*
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*Figure 12. RUN:PRTLINE(103) for JCL(CBL0033J)*
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**Lab hints**
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13. The error is located on line 11, adjust 'ACCTREX' accordingly.
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![](Images/image140.png)
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*Figure 13. Error in id.JCL(CBL0003J).jcl*
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*Figure 13. Error in id.JCL(CBL0033J).jcl*
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\newpage
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- **Specifying the return value**
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- **Summary**
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- **Lab**
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## Styles of programming
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In summary, this chapter should provide the necessary foundation to understand structured programming and how it relates to COBOL and its importance to understanding and maintaining code. Many examples of how, when and why to implement key techniques have been provided and explained for further understanding. You should be able to identify the basic differences between structured programming (COBOL) and OO programming (Java). You should also understand the general concept of the best practices in the structure of the Procedure Division with reference to the design and content of paragraphs, program control options and ways to call other programs within the same system.
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## Lab
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This lab utilizes COBOL program CBL0003, located within your id.CBL data set, as well as JCL job CBL0003J, located within your id.JCL data set. The JCL jobs are used to compile and execute the COBOL programs, as discussed in previous chapters.
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#### Using VSCode and Zowe Explorer
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1. Take a moment and look over the source code of the COBOL program provided: CBL0003.
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2. Compare CBL0003 with CBL0001 and CBL0002 from the previous lab. Do you notice the differences?
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a. Observe the new COUNTER line within the WORKING-STORAGE > DATA DIVISION.
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b. Observe the paragraphs are numerated and they are all explicitly ended by a -END sentence.
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b. Observe the new paragraphs READ-FIRST-RECORD, READ-TEN-RECORDS, READ-ANOTHER-RECORD, READ-NEXT-RECORDS and CALLING-SUBPROGRAM within the PRECEDURE DIVISION.
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c. These paragraphs perform the same loop as in CBL0001, but using the PERFORM statement in different ways. The CALLING-SUBPROGRAM calls the HELLO program, already presented in the second Lab of this course.
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3. Submit job: CBL0003J. This JCL first compiles the program HELLO,
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then compiles CBL0003 and links the result of both compilations
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together.
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4. View CBL0003J output using the JOBS section and open RUN:PRTLINE, observe the report is identical to CBL0001.
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5. View output of target program HELLO using the JOBS section and open RUN:SYSOUT.
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\newpage
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# File output

‎COBOL Programming Course #1 - Getting Started/Labs/cbl/CBL0003.cobol‎

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*-----------------------
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IDENTIFICATION DIVISION.
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*-----------------------
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PROGRAM-ID. CBL0003
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AUTHOR. Otto B. Fun.
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*--------------------
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ENVIRONMENT DIVISION.
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*--------------------
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INPUT-OUTPUT SECTION.
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FILE-CONTROL.
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SELECT PRINT-LINE ASSIGN TO PRTLINE.
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SELECT ACCT-REC ASSIGN TO ACCTREC.
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*-------------
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DATA DIVISION.
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*-------------
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FILE SECTION.
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FD PRINT-LINE RECORDING MODE F.
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01 PRINT-REC.
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05 ACCT-NO-O PIC X(8).
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05 ACCT-LIMIT-O PIC $$,$$$,$$9.99.
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05 ACCT-BALANCE-O PIC $$,$$$,$$9.99.
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05 LAST-NAME-O PIC X(20).
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05 FIRST-NAME-O PIC X(15).
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05 COMMENTS-O PIC X(50).
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*
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FD ACCT-REC RECORDING MODE F.
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01 ACCT-FIELDS.
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05 ACCT-NO PIC X(8).
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05 ACCT-LIMIT PIC S9(7)V99 COMP-3.
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05 ACCT-BALANCE PIC S9(7)V99 COMP-3.
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05 LAST-NAME PIC X(20).
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05 FIRST-NAME PIC X(15).
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05 CLIENT-ADDR.
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10 STREET-ADDR PIC X(25).
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10 CITY-COUNTY PIC X(20).
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10 USA-STATE PIC X(15).
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05 RESERVED PIC X(7).
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05 COMMENTS PIC X(50).
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*
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WORKING-STORAGE SECTION.
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01 FLAGS.
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05 LASTREC PIC X VALUE SPACE.
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01 COUNTER PIC 9(2) VALUE 0.
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*COUNTER is used for the PERFORM VARYING statement
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*------------------
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PROCEDURE DIVISION.
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*------------------
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1000-OPEN-FILES.
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OPEN INPUT ACCT-REC.
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OPEN OUTPUT PRINT-LINE.
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1000-OPEN-FILES-END.
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*The prefix "1000" is increased thoughout the code and
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*is used as a programming technique to better locate
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*referenced paragraphs in a sentence.
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*The paragraph suffixed with "-END" is an empty one
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*that serves as a visual delimiter for ending a paragraph
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*similiar to a "}" in other programming languages
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*
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2000-READ-FIRST-RECORD.
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PERFORM 4000-READ-RECORD.
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PERFORM 5000-WRITE-RECORD.
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GO TO 2100-READ-TEN-RECORDS.
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*GO TO passes control to another section of the code, but
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*unlike the PERFORM keyword, it will not return control
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*to the next line in the code
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2000-READ-FIRST-RECORD-END.
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*
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DISPLAY ' THIS IS THE FIRST RECORD '.
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*notice that because of GO TO, this command will
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*never be executed
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*
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2100-READ-TEN-RECORDS.
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PERFORM 10 TIMES
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PERFORM 4000-READ-RECORD
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PERFORM 5000-WRITE-RECORD
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END-PERFORM.
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2100-READ-TEN-RECORDS-END.
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*TIMES repeats a perform statement, it's number can be
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*either set or given by a variable
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*
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2200-READ-ANOTHER-RECORD.
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PERFORM 4000-READ-RECORD THRU 5000-WRITE-RECORD.
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2200-READ-ANOTHER-RECORD-END.
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*THRU or THROUGH list the start and end of which
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*paragraphs will be executed in a sequential order
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*
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2300-READ-NEXT-RECORDS.
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PERFORM VARYING COUNTER FROM 1 BY 1 UNTIL COUNTER
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EQUAL 34
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PERFORM 4000-READ-RECORD THRU 5000-WRITE-RECORD
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END-PERFORM.
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2300-READ-NEXT-RECORDS-END.
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*Loop printing the remaining 34 records by varying the
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*variable COUNTER after each iteration.
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*The sentence PERFORM VARYING is continued on the next
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*line by starting on the B Area (column 12)
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*
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2400-CALLING-SUBPROGRAM.
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CALL 'HELLO'.
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2400-CALLING-SUBPROGRAM-END.
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*The program HELLO from the first Lab is called as a
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*subprogram from CBL0003. The JCL that compiles CBL0003
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*also compiles HELLO and links them together.
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*
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3000-CLOSE-STOP.
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CLOSE ACCT-REC.
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CLOSE PRINT-LINE.
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STOP RUN.
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*Without STOP RUN here, the next paragraphs would
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*execute once more
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3000-CLOSE-STOP-END.
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*
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4000-READ-RECORD.
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READ ACCT-REC
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AT END MOVE 'Y' TO LASTREC
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END-READ.
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4000-READ-RECORD-END.
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*
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5000-WRITE-RECORD.
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MOVE ACCT-NO TO ACCT-NO-O.
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MOVE ACCT-LIMIT TO ACCT-LIMIT-O.
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MOVE ACCT-BALANCE TO ACCT-BALANCE-O.
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MOVE LAST-NAME TO LAST-NAME-O.
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MOVE FIRST-NAME TO FIRST-NAME-O.
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MOVE COMMENTS TO COMMENTS-O.
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WRITE PRINT-REC.
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5000-WRITE-RECORD-END.
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*

‎COBOL Programming Course #1 - Getting Started/Labs/jcl/CBL0003J.jcl‎

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//CBL0003J JOB 1,NOTIFY=&SYSUID
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//***************************************************/
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//COBRUN EXEC IGYWCL
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//COBOL.SYSIN DD DSN=&SYSUID..CBL(CBL0001),DISP=SHR
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//LKED.SYSLMOD DD DSN=&SYSUID..LOAD(CBL0001),DISP=SHR
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//COBOL.SYSIN DD DSN=&SYSUID..CBL(HELLO),DISP=SHR
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//LKED.SYSLMOD DD DSN=&SYSUID..LOAD(HELLO),DISP=SHR
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//***************************************************/
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// IF RC = 0 THEN
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//***************************************************/
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//RUN EXEC PGM=CBL0001
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//COBRUN EXEC IGYWCL
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//COBOL.SYSIN DD DSN=&SYSUID..CBL(CBL0003),DISP=SHR
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//LKED.SYSLMOD DD DSN=&SYSUID..LOAD(CBL0003),DISP=SHR
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//LKED.SYSLIB DD DSN=&SYSUID..LOAD(HELLO),DISP=SHR
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//***************************************************/
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// IF RC = 0 THEN
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//***************************************************/
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//RUN EXEC PGM=CBL0003
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//STEPLIB DD DSN=&SYSUID..LOAD,DISP=SHR
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//ACCTREX DD DSN=&SYSUID..DATA,DISP=SHR
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//ACCTREC DD DSN=&SYSUID..DATA,DISP=SHR
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//PRTLINE DD SYSOUT=*,OUTLIM=15000
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//SYSOUT DD SYSOUT=*,OUTLIM=15000
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//CEEDUMP DD DUMMY
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//SYSUDUMP DD DUMMY
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//***************************************************/
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// ELSE
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// ENDIF
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// ELSE
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// ENDIF

‎COBOL Programming Course #1 - Getting Started/Labs/jcl/CBL0033J.jcl‎

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//CBL0003J JOB 1,NOTIFY=&SYSUID
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//***************************************************/
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//COBRUN EXEC IGYWCL
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//COBOL.SYSIN DD DSN=&SYSUID..CBL(CBL0001),DISP=SHR
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//LKED.SYSLMOD DD DSN=&SYSUID..LOAD(CBL0001),DISP=SHR
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//***************************************************/
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// IF RC = 0 THEN
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//***************************************************/
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//RUN EXEC PGM=CBL0001
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//STEPLIB DD DSN=&SYSUID..LOAD,DISP=SHR
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//ACCTREX DD DSN=&SYSUID..DATA,DISP=SHR
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//PRTLINE DD SYSOUT=*,OUTLIM=15000
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//SYSOUT DD SYSOUT=*,OUTLIM=15000
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//CEEDUMP DD DUMMY
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//SYSUDUMP DD DUMMY
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//***************************************************/
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// ELSE
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// ENDIF

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