• 关于文件的处理


    读取文件的方式:
    顺序读取的方式(A是定义读取文件的名称,可随意命名,文件地址一般为绝对路径)

           ENVIRONMENT DIVISION.
           INPUT-OUTPUT SECTION.
           FILE-CONTROL.
              SELECT A ASSIGN TO 'C:OCinput.txt'
              ORGANIZATION IS LINE SEQUENTIAL.  

     具体全部代码:(顺序读取一个文件)

     1        IDENTIFICATION  DIVISION.
     2        PROGRAM-ID.     HELLO.
     3 
     4        ENVIRONMENT DIVISION.
     5        INPUT-OUTPUT SECTION.
     6        FILE-CONTROL.
     7           SELECT A ASSIGN TO 'C:OCinput.txt'
     8           ORGANIZATION IS LINE SEQUENTIAL.
     9 
    10           DATA DIVISION.
    11           FILE SECTION.
    12       *FD语句主要用来描述与文件记录相关的物理信息,如记录实际格式,长度等。
    13           FD A.
    14           01 STUDENT-FILE.
    15               05 STUDENT-ID PIC 9(5).
    16               05 WS-NAME PIC A(25).
    17 
    18 
    19           WORKING-STORAGE SECTION.
    20           01 WS-STUDENT.
    21               05 WS-STUDENT-ID PIC 9(5).
    22               05 WS-NAME PIC A(25).
    23           01 WS-EOF PIC A(1).
    24 
    25       *程序运行主体部分
    26        PROCEDURE DIVISION.
    27       *打开文件A作为输入文件,类似于c中的读取文件
    28           OPEN INPUT A.
    29       *循环读取文件A,并将数据放入WS-STUDENT,并打印WS-STUDENT
    30              PERFORM UNTIL WS-EOF='Y'
    31                 READ A INTO WS-STUDENT
    32                    AT END MOVE 'Y' TO WS-EOF
    33                    NOT AT END DISPLAY WS-STUDENT
    34       *读取完毕后,关闭所有读取,结束循环,关闭文件A
    35                 END-READ
    36               END-PERFORM.
    37           CLOSE A.
    38        STOP RUN.

     写入文件:

           IDENTIFICATION  DIVISION.
           PROGRAM-ID.     HELLO.
    
           ENVIRONMENT DIVISION.
              INPUT-OUTPUT SECTION.
              FILE-CONTROL.
          *写入文件,一般为绝对文件 
              SELECT STUDENT ASSIGN TO 'C:OCinput.txt'
                 ORGANIZATION IS SEQUENTIAL
                 ACCESS IS SEQUENTIAL.
    
           DATA DIVISION.
              FILE SECTION.
          *FD语句主要用来描述与文件记录相关的物理信息,如记录实际格式,长度等。
              FD STUDENT.
              01 STUDENT-FILE.
                  05 STUDENT-ID PIC 9(5).
                  05 NAME PIC A(25).
                  05 CLAS PIC X(3).
    
    
              WORKING-STORAGE SECTION.
              01 WS-STUDENT.
                  05 WS-STUDENT-ID PIC 9(5).
                  05 WS-NAME PIC A(25).
                  05 WS-CLASS PIC X(3).
    
          *程序运行主体部分
           PROCEDURE DIVISION.
          *打开要写入文件
              OPEN EXTEND STUDENT.
                 MOVE 1000 TO STUDENT-ID.
                 MOVE 'TIM' TO NAME.
                 MOVE '10' TO CLAS.
          *将暂存文件STUDENT-FILE写入文件
                 WRITE STUDENT-FILE
                 END-WRITE.
              CLOSE STUDENT.
           STOP RUN.
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  • 原文地址:https://www.cnblogs.com/shanshuiyouxiangfeng/p/13926406.html
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