使用z/OS进行文件读写的示例代码

该示例代码展示了如何在z/OS上使用COBOL编写程序，以读取和写入文件。通过使用特定的I/O语句，程序可以打开、读取和关闭文件。该示例代码采用了标准的文件处理方式，还包括了错误处理机制来提高程序的可靠性。

IDENTIFICATION DIVISION.
       PROGRAM-ID. READ-WRITE-FILE.
       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
       SELECT EMP-FILE-IN ASSIGN TO "EMPLOYEE.DATA" 
                  ORGANIZATION IS SEQUENTIAL.
       SELECT EMP-FILE-OUT ASSIGN TO "EMPLOYEE.NEW" 
                  ORGANIZATION IS SEQUENTIAL.                
       DATA DIVISION.
       FILE SECTION.
       FD EMP-FILE-IN.
       01 EMPLOYEE-REC-IN.
          05 EMP-ID-IN PIC 9(4).
          05 EMP-NAME-IN PIC X(20).
          05 EMP-DEPT-IN PIC X(10).
       FD EMP-FILE-OUT.
       01 EMPLOYEE-REC-OUT.
          05 EMP-ID-OUT PIC 9(4).
          05 EMP-NAME-OUT PIC X(20).
          05 EMP-DEPT-OUT PIC X(10).
       WORKING-STORAGE SECTION.
       01 WS-EOF     PIC X VALUE 'N'.
       PROCEDURE DIVISION.
           OPEN-FILES.
              OPEN EXTEND EMP-FILE-OUT.
              OPEN INPUT EMP-FILE-IN.
           READ-EMPLOYEE-FILE.
              READ EMP-FILE-IN INTO EMPLOYEE-REC-IN
                 AT END SET WS-EOF TO 'Y'.
           WRITE-EMPLOYEE-FILE.
              WRITE EMPLOYEE-REC-OUT.
           CLOSE-EMPLOYEE-FILE.
              CLOSE EMP-FILE-IN.
              CLOSE EMP-FILE-OUT.

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