COBOL文件处理示例与技术解析

COBOL是一种面向商业应用的编程语言，常用于处理大型数据文件。以下示例展示了如何读取和处理COBOL文件，并提供了相关技术解析和说明。

       IDENTIFICATION DIVISION.
       PROGRAM-ID. FileProcessing.
       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
           SELECT SalesFile ASSIGN TO "SALES.DAT".
           ORGANIZATION IS LINE SEQUENTIAL.

       DATA DIVISION.
       FILE SECTION.
       FD SalesFile.
       01 SalesRecord.
           05 SalesID     PIC 9(5).
           05 ProductCode PIC X(10).
           05 Quantity    PIC 9(3).

       WORKING-STORAGE SECTION.
       01 TotalQuantity PIC 9(5) VALUE 0.

       PROCEDURE DIVISION.
       OPEN INPUT SalesFile.
       READ SalesFile
           AT END
               DISPLAY "End of file reached."
           NOT AT END
               ADD Quantity TO TotalQuantity
               DISPLAY "Sales ID: " SalesID ", Product Code: " ProductCode ", Quantity: " Quantity
       END-READ.
       CLOSE SalesFile.
       DISPLAY "Total Quantity: " TotalQuantity.
       STOP RUN.

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