如何使用if语句跳过COBOL中的记录
输入文件如下所示如何使用if语句跳过COBOL中的记录,cobol,Cobol,输入文件如下所示 FD STUDENTS-FILE-IN. 01 STUDENTS-RECORD-IN. 05 SSN-IN PIC X(9). 05 STUDENT-NAME-IN PIC X(11). 05 PIC X(5). 05 GRAD-STATUS-IN PIC X.
FD STUDENTS-FILE-IN.
01 STUDENTS-RECORD-IN.
05 SSN-IN PIC X(9).
05 STUDENT-NAME-IN PIC X(11).
05 PIC X(5).
05 GRAD-STATUS-IN PIC X.
05 CLASS-STANDING-IN PIC X.
05 MAJOR-IN PIC X(3).
05 CREDIT-HOURS-IN PIC 9(3).
05 CREDIT-POINTS-IN PIC 9(3).
FD STUDENTS-FILE-OUT.
01 STUDENTS-RECORD-OUT PIC X(80).
WORKING-STORAGE SECTION.
01 ARE-THERE-MORE-RECORDS PIC X(3) VALUE 'YES'.
01 PAGE-NUMBER PIC 99 VALUE ZERO.
01 LINE-COUNT PIC 99 VALUE ZERO.
01 SSID-BREAK.
03 FIRST-PART PIC X(3).
03 SECOND-PART PIC X(2).
03 THIRD-PART PIC X(4).
01 NAME-BREAK.
03 FIRST-LETTER PIC X(1).
03 MIDDLE-LETTER PIC X(1).
03 LAST-LETTER PIC X(10).
01 GRAD-CHECK PIC X.
01 WS-DATE.
05 RUN-YEAR PIC XX.
05 RUN-MONTH PIC XX.
05 RUN-DAY PIC XX.
01 HEADING-LINE-ONE.
05 PIC X(21) VALUE SPACES.
05 PIC X(33)
VALUE 'RHODES STATE COLLEGE GRADE REPORT'.
05 PIC X(6) VALUE SPACES.
05 HEADING-LINE-DATE.
10 MONTH-NOW PIC XX.
10 PIC X VALUE '/'.
10 DAY-NOW PIC XX.
10 PIC X VALUE '/'.
10 YEAR-NOW PIC XX.
05 PIC X(3) VALUE SPACES.
05 PIC X(4) VALUE 'PAGE'.
05 HL-1-PAGE-NUMBER PIC Z9 VALUE ZEROS.
01 HEADING-LINE-TWO.
05 PIC X(10) VALUE 'SOC SEC NO'.
05 PIC X(4) VALUE SPACES.
05 PIC X(12) VALUE 'STUDENT NAME'.
05 PIC X(3) VALUE SPACES.
05 PIC X(8) VALUE 'STANDING'.
05 PIC X(4) VALUE SPACES.
05 PIC X(5) VALUE 'MAJOR'.
05 PIC X(10) VALUE SPACES.
05 PIC X(5) VALUE 'HOURS'.
05 PIC X(2) VALUE SPACES.
05 PIC X(6) VALUE 'POINTS'.
05 PIC X(5) VALUE SPACES.
05 PIC X(3) VALUE 'GPA'.
01 DETAIL-LINE.
05 DL-SSID.
10 SSID-1 PIC X(3).
10 PIC X VALUE "-".
10 SSID-2 PIC X(2).
10 PIC X VALUE "-".
10 SSID-3 PIC X(4).
05 BLANK-B PIC X(3) VALUE SPACES.
05 DL-NAME .
10 FIRST-INI PIC X.
10 PIC X VALUE SPACES.
10 MID-INI PIC X.
10 PIC X VALUE SPACES.
10 LAST-NAME PIC X(10).
05 BLANK-C PIC X(3) VALUE SPACES.
05 YEAR-STATUS PIC X(9).
05 BLANK-D PIC X(3) VALUE SPACES.
05 STUDENT-MAJOR PIC X(13).
05 BLANK-E PIC X(5) VALUE SPACES.
05 STUDNET-HOURS PIC ZZ9.
05 BLANK-F PIC X(5) VALUE SPACES.
05 STUDENT-POINTS PIC ZZ9.
05 BLANK-G PIC X(4) VALUE SPACES.
05 STUDENT-GPA PIC 9V99.
01 TOTALS-LINE.
05 TOTALS PIC X(6) VALUE 'TOTALS'.
05 PIC X(34) VALUE SPACES.
05 HITS-TOTAL PIC ZZZ,ZZZ.
05 PIC X(9) VALUE SPACES.
05 BATS-TOTAL PIC ZZZ,ZZZ.
05 PIC X(10) VALUE SPACES.
05 AVG-TOTAL PIC .999.
PROCEDURE DIVISION.
100-MAIN.
OPEN INPUT STUDENTS-FILE-IN
OPEN OUTPUT STUDENTS-FILE-OUT
ACCEPT WS-DATE FROM DATE
MOVE RUN-MONTH TO MONTH-NOW
MOVE RUN-DAY TO DAY-NOW
MOVE RUN-YEAR TO YEAR-NOW
PERFORM 300-WRITE-HEADINGS
PERFORM UNTIL ARE-THERE-MORE-RECORDS = 'NO '
READ STUDENTS-FILE-IN
AT END
MOVE 'NO ' TO ARE-THERE-MORE-RECORDS
NOT AT END
PERFORM 200-PROCESS-ONE-RECORD
END-READ
END-PERFORM
CLOSE STUDENTS-FILE-IN
CLOSE STUDENTS-FILE-OUT
STOP RUN.
200-PROCESS-ONE-RECORD.
IF LINE-COUNT >= 53
PERFORM 300-WRITE-HEADINGS
END-IF
* IF GRAD-STATUS-IN NOT = '1' AND NOT = '2'
* PERFORM 400-WRITE-TOTALS.
* END-IF
MOVE SSN-IN TO SSID-BREAK
MOVE FIRST-PART TO SSID-1
MOVE SECOND-PART TO SSID-2
MOVE THIRD-PART TO SSID-3
MOVE STUDENT-NAME-IN TO NAME-BREAK
MOVE FIRST-LETTER TO FIRST-INI
MOVE MIDDLE-LETTER TO MID-INI
MOVE LAST-LETTER TO LAST-NAME
MOVE GRAD-STATUS-IN TO GRAD-CHECK
IF GRAD-CHECK = 'Y'
END-IF
MOVE DETAIL-LINE TO STUDENTS-RECORD-OUT
WRITE STUDENTS-RECORD-OUT
AFTER ADVANCING 1 LINES
ADD 1 TO LINE-COUNT.
基本上，某些文件不符合要求，我们只是想跳过它们。这是一个我们不想写入输出文件并跳过的文件示例。如果我解释得不好，我深表歉意，但我确实在与COBOL作斗争。您的200段需要这样做：
307662099KRAlexander Y2NES005017
如果没有(
IF NOT ( <condition-for-skipping )
PERFORM PROCESS-THIS-RECORD
ELSE
PERFORM IGNORE-THIS-RECORD
END-IF
IF ( <condition-for-skipping )
PERFORM IGNORE-THIS-RECORD
ELSE
PERFORM PROCESS-THIS-RECORD
END-IF