COBOL文件读取示例及技术解答

此示例展示了如何使用COBOL编程语言读取文件，并解释了文件读取的实现方式和技术细节。COBOL作为一种古老但仍在使用的编程语言，其文件处理功能仍然被广泛应用于企业级系统中。

IDENTIFICATION DIVISION.
PROGRAM-ID. READ-FILE-EXAMPLE.

ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
    SELECT FILE-NAME ASSIGN TO "example.txt".
    ORGANIZATION IS LINE SEQUENTIAL.

DATA DIVISION.
FILE SECTION.
FD FILE-NAME.
01 FILE-RECORD.
   05 DATA-READ PIC X(50).

WORKING-STORAGE SECTION.
01 WS-EOF PIC X VALUE 'N'.

PROCEDURE DIVISION.
MAIN-LOGIC.
    OPEN INPUT FILE-NAME.
    READ FILE-NAME
        AT END MOVE 'Y' TO WS-EOF
    END-READ.

    PERFORM UNTIL WS-EOF = 'Y'
        DISPLAY "Data read from file: " DATA-READ
        READ FILE-NAME
            AT END MOVE 'Y' TO WS-EOF
        END-READ
    END-PERFORM.

    CLOSE FILE-NAME.
    STOP RUN.

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