Mystery COBOL example code

        IDENTIFICATION DIVISION.
        PROGRAM-ID. sample_1nn.
        ENVIRONMENT DIVISION.
        INPUT-OUTPUT SECTION.
        FILE-CONTROL. SELECT EMPLOYEE-DATA    ASSIGN TO "EMP.DAT".
                      SELECT PAYROLL-LISTING  ASSIGN TO "PAY.OUT".
        DATA DIVISION.
        FILE SECTION.
        FD  EMPLOYEE-DATA.
        01  EMPLOYEE-RECORD.
            05  EMPLOYEE-NAME-IN    PICTURE X(20).
            05  HOURS-WORKED-IN     PICTURE 9(2).
            05  HOURLY-RATE-IN      PICTURE 9V99.
        FD  PAYROLL-LISTING.
        01  PRINT-REC.
            05                      PICTURE X(20).
            05  NAME-OUT            PICTURE X(20).
            05                      PICTURE X(10).
            05  HOURS-OUT           PICTURE 9(2).
            05                      PICTURE X(8).
            05  RATE-OUT            PICTURE 9.99.
            05                      PICTURE X(6).
            05  WEEKLY-WAGES-OUT    PICTURE 999.99.
        WORKING-STORAGE SECTION.
        01  ARE-THERE-MORE-RECORDS  PICTURE XXX VALUE 'YES'.
        PROCEDURE DIVISION.
        100-MAIN-MODULE.
            OPEN INPUT EMPLOYEE-DATA
                 OUTPUT PAYROLL-LISTING
            PERFORM UNTIL ARE-THERE-MORE-RECORDS = 'NO '
                READ EMPLOYEE-DATA
                    AT END
                        MOVE 'NO ' TO ARE-THERE-MORE-RECORDS
                    NOT AT END
                        PERFORM 200-WAGE-ROUTINE
                END-READ
            END-PERFORM
            CLOSE EMPLOYEE-DATA
                  PAYROLL-LISTING
            STOP RUN.
        200-WAGE-ROUTINE.
            MOVE SPACES TO PRINT-REC
            MOVE EMPLOYEE-NAME-IN TO NAME-OUT
            MOVE HOURS-WORKED-IN  TO HOURS-OUT
            MOVE HOURLY-RATE-IN   TO RATE-OUT
            MULTIPLY HOURS-WORKED-IN BY HOURLY-RATE-IN
                GIVING WEEKLY-WAGES-OUT
            END-MULTIPLY
            WRITE PRINT-REC
            END-WRITE.