使用z/OS实现COBOL程序中的文件读取与写入操作

这个示例展示了如何在z/OS环境中使用COBOL编程语言进行文件读取和写入操作。通过COBOL编写的程序可以打开、读取和写入文件，展示了如何在z/OS平台上处理文件操作。

       IDENTIFICATION DIVISION.
       PROGRAM-ID. FILE-OPERATIONS.

       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
           SELECT FILE1 ASSIGN TO 'INPUTFILE'
               ORGANIZATION IS LINE SEQUENTIAL.
           SELECT FILE2 ASSIGN TO 'OUTPUTFILE'
               ORGANIZATION IS LINE SEQUENTIAL.

       DATA DIVISION.
       FILE SECTION.
       FD FILE1.
       01 INPUT-RECORD.
           05 INPUT-FIELD1 PIC X(20).
           05 INPUT-FIELD2 PIC X(20).
       FD FILE2.
       01 OUTPUT-RECORD.
           05 OUTPUT-FIELD1 PIC X(20).
           05 OUTPUT-FIELD2 PIC X(20).

       PROCEDURE DIVISION.
       OPEN-FILES.
           OPEN INPUT FILE1 OUTPUT FILE2.
       READ-WRITE-FILES.
           READ FILE1
               AT END
                   MOVE 'EOF' TO OUTPUT-FIELD1
                   GO TO CLOSE-FILES.
               MOVE INPUT-FIELD1 TO OUTPUT-FIELD1
               MOVE INPUT-FIELD2 TO OUTPUT-FIELD2
               WRITE OUTPUT-RECORD.
               GO TO READ-WRITE-FILES.
       CLOSE-FILES.
           CLOSE FILE1 FILE2.
           STOP RUN.

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