Sorting Example: With Control Break in COBOL

ENVIRONMENT DIVISION.
INPUT-OUTPUT SECTION.
FILE-CONTROL.
SELECT IN-FILE
ASSIGN TO 'C:\PCOBWIN\ROGERS\UNSORTED.TXT'
ORGANIZATION IS LINE SEQUENTIAL.
SELECT OUT-FILE
ASSIGN TO 'C:\PCOBWIN\ROGERS\SORTED4.TXT'
ORGANIZATION IS LINE SEQUENTIAL.
SELECT SORT-FILE
ASSIGN TO 'C:\PCOBWIN\ROGERS\WORK.TMP'.

DATA DIVISION.
FILE SECTION.
FD IN-FILE
DATA RECORD IS IN-RECORD.
01 IN-RECORD.
02 IN-ID PIC 9(5).
02 IN-LAST-NAME PIC X(15).
02 IN-FIRST-NAME PIC X(10).
02 IN-CITY PIC X(12).
02 IN-STATE PIC X(2).
88 VALID-STATE-CODE VALUES 'AK'
'AL' 'AR' 'AZ' 'CA' 'CO' 'CT' 'DC' 'DE' 'FL' 'GA'
'HI' 'IA' 'ID' 'IL' 'IN' 'KS' 'KY' 'LA' 'MA' 'MD'
'ME' 'MI' 'MN' 'MO' 'MS' 'MT' 'NC' 'ND' 'NE' 'NH'
'NJ' 'NM' 'NV' 'NY' 'OH' 'OK' 'OR' 'PA' 'RI' 'SC'
'SD' 'TN' 'TX' 'UT' 'VA' 'VT' 'WA' 'WI' 'WV' 'WY'.

FD OUT-FILE
DATA RECORD IS OUT-RECORD.
01 OUT-RECORD PIC X(80).

SD SORT-FILE
DATA RECORD IS SORT-RECORD.
01 SORT-RECORD.
02 SORT-ID PIC 9(5).
02 SORT-LAST-NAME PIC X(15).
02 SORT-FIRST-NAME PIC X(10).
02 SORT-CITY PIC X(12).
02 SORT-STATE PIC X(2).

WORKING-STORAGE SECTION.

01 DETAIL-LINE.
02 DETAIL-ID PIC 9(5).
02 PIC X(3) VALUE SPACES.
02 DETAIL-LAST-NAME PIC X(15).
02 PIC X(3) VALUE SPACES.
02 DETAIL-FIRST-NAME PIC X(10).
02 PIC X(3) VALUE SPACES.
02 DETAIL-CITY PIC X(12).
02 PIC X(3) VALUE SPACES.
02 DETAIL-STATE PIC X(2).

01 SORTED-DATA-SWITCH PIC X VALUE 'N'.
88 NO-MORE-SORTED-DATA VALUE 'Y'.

01 EOF-SWITCH PIC X VALUE 'N'.
88 NO-MORE-INPUT-RECORDS VALUE 'Y'.

01 STATE-COUNT PIC 9(3) VALUE ZERO.

01 BREAK-LINE.
02 PIC X(8) VALUE SPACES.
02 PRINT-COUNT PIC ZZ9.
02 PIC X(12)
VALUE ' RECORDS IN '.
02 CURRENT-STATE PIC X(2).

PROCEDURE DIVISION.
MAIN-LOGIC.
SORT SORT-FILE
ON ASCENDING KEY SORT-STATE
ON ASCENDING KEY SORT-LAST-NAME
INPUT PROCEDURE IS INPUT-LOGIC
OUTPUT PROCEDURE IS CREATE-REPORT.
STOP RUN.

INPUT-LOGIC.
OPEN INPUT IN-FILE.
READ IN-FILE
AT END MOVE 'Y' TO EOF-SWITCH.
PERFORM DATA-LOOP
UNTIL NO-MORE-INPUT-RECORDS.
CLOSE IN-FILE.

DATA-LOOP.
IF VALID-STATE-CODE
MOVE IN-RECORD TO SORT-RECORD
RELEASE SORT-RECORD.
READ IN-FILE
AT END MOVE 'Y' TO EOF-SWITCH.

CREATE-REPORT.
OPEN OUTPUT OUT-FILE.
RETURN SORT-FILE
AT END MOVE 'Y' TO SORTED-DATA-SWITCH.
MOVE SORT-STATE TO CURRENT-STATE.
PERFORM REPORT-LOOP
UNTIL NO-MORE-SORTED-DATA.
PERFORM DO-CONTROL-BREAK.
CLOSE OUT-FILE.

REPORT-LOOP.
IF SORT-STATE NOT = CURRENT-STATE
PERFORM DO-CONTROL-BREAK.
MOVE SORT-ID TO DETAIL-ID
MOVE SORT-LAST-NAME TO DETAIL-LAST-NAME.
MOVE SORT-FIRST-NAME TO DETAIL-FIRST-NAME.
MOVE SORT-CITY TO DETAIL-CITY.
MOVE SORT-STATE TO DETAIL-STATE.
WRITE OUT-RECORD FROM DETAIL-LINE.
ADD 1 TO STATE-COUNT.
MOVE SORT-STATE TO CURRENT-STATE.
RETURN SORT-FILE
AT END MOVE 'Y' TO SORTED-DATA-SWITCH.

DO-CONTROL-BREAK.
MOVE STATE-COUNT TO PRINT-COUNT.
WRITE OUT-RECORD FROM BREAK-LINE AFTER 2.
MOVE ZERO TO STATE-COUNT
MOVE SPACES TO OUT-RECORD.
WRITE OUT-RECORD.

Input

91163Dube Jason Chicago IL
61535King Adriane Cincinnati OH
45636Holtz Rachel Newport KY
10216Gehl Bryan Louisville KY
52158Flynn Ashley Muskegon MI
22277Theis Hanah Norwood OH
38551Solpa Mac Lansing MI
78496McCoy Amanda Brookfield WI
65720Read Sean Springfield BF
94000Waymel Bradley Kalamazoo MI
42966Vilella Reza Urbana IL
04928Streeter Farhad Toledo OH
69216Steele Karen Covington KY
56913Moreno Jan Dayton OH
34932Vogel Sandra Grand RapidsMI

Output (report with control break)

91163 Dube Jason Chicago IL
42966 Vilella Reza Urbana IL

2 RECORDS IN IL

10216 Gehl Bryan Louisville KY
45636 Holtz Rachel Newport KY
69216 Steele Karen Covington KY

3 RECORDS IN KY

52158 Flynn Ashley Muskegon MI
38551 Solpa Mac Lansing MI
34932 Vogel Sandra Grand Rapids MI
94000 Waymel Bradley Kalamazoo MI

4 RECORDS IN MI

61535 King Adriane Cincinnati OH
56913 Moreno Jan Dayton OH
04928 Streeter Farhad Toledo OH
22277 Theis Hanah Norwood OH

4 RECORDS IN OH

78496 McCoy Amanda Brookfield WI

1 RECORDS IN WI