The LOCAL-STORAGE SECTION represents sophisticated automatic data initialization and program-specific storage management within COBOL programming environments, providing guaranteed fresh data state, comprehensive memory reinitialization, and advanced program lifecycle management that enable reliable program execution, efficient data isolation, and optimized resource utilization. This section embodies advanced memory management principles by supporting automatic data reset, enabling clean program state, and facilitating comprehensive data initialization requirements while maintaining execution efficiency, ensuring data integrity, and enabling complex programming scenarios across enterprise applications requiring detailed memory control, automated initialization processes, and reliable data management with optimized performance characteristics and consistent state management throughout the program execution lifecycle.
123456789101112131415161718192021222324252627282930313233343536DATA DIVISION. LOCAL-STORAGE SECTION. 01 data-name-1 PIC clause [VALUE clause]. 01 data-name-2. 05 subordinate-item PIC clause [VALUE clause]. *> Example with initialization DATA DIVISION. LOCAL-STORAGE SECTION. 01 LS-COUNTERS. 05 LS-RECORD-COUNT PIC 9(6) VALUE 0. 05 LS-ERROR-COUNT PIC 9(4) VALUE 0. 05 LS-PROCESS-COUNT PIC 9(5) VALUE 0. 01 LS-FLAGS. 05 LS-FIRST-TIME PIC X VALUE 'Y'. 05 LS-VALIDATION-FLAG PIC X VALUE 'N'. 05 LS-DEBUG-MODE PIC X VALUE 'N'. 01 LS-WORK-AREAS. 05 LS-TEMP-STRING PIC X(100) VALUE SPACES. 05 LS-CALCULATION-WORK PIC 9(8)V99 VALUE ZERO. 05 LS-DATE-WORK PIC 9(8) VALUE 0. *> Complex structures with automatic initialization 01 LS-EMPLOYEE-WORK. 05 LS-EMP-ID PIC 9(6) VALUE 0. 05 LS-EMP-NAME PIC X(30) VALUE SPACES. 05 LS-EMP-SALARY PIC 9(7)V99 VALUE 0. 05 LS-EMP-STATUS PIC X(10) VALUE "INACTIVE". 01 LS-TABLE-WORK. 05 LS-TABLE-ENTRIES OCCURS 10 TIMES. 10 LS-ENTRY-KEY PIC X(5) VALUE SPACES. 10 LS-ENTRY-VALUE PIC 9(8) VALUE 0. 10 LS-ENTRY-FLAG PIC X VALUE 'N'.
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PROGRAM-ID. LOCAL-STORAGE-DEMO. DATA DIVISION. *> WORKING-STORAGE for persistent data WORKING-STORAGE SECTION. 01 WS-CALL-COUNTER PIC 9(4) VALUE 0. 01 WS-PROGRAM-NAME PIC X(30) VALUE "LOCAL-STORAGE-DEMO". 01 WS-PERSISTENT-FLAGS. 05 WS-FIRST-CALL PIC X VALUE 'Y'. 05 WS-DEMO-MODE PIC X VALUE 'Y'. *> LOCAL-STORAGE for automatic reinitialization LOCAL-STORAGE SECTION. 01 LS-SESSION-DATA. 05 LS-SESSION-ID PIC 9(8) VALUE 0. 05 LS-START-TIME PIC 9(8) VALUE 0. 05 LS-END-TIME PIC 9(8) VALUE 0. 05 LS-DURATION PIC 9(6) VALUE 0. 01 LS-PROCESSING-COUNTERS. 05 LS-RECORDS-PROCESSED PIC 9(6) VALUE 0. 05 LS-RECORDS-VALIDATED PIC 9(6) VALUE 0. 05 LS-RECORDS-REJECTED PIC 9(5) VALUE 0. 05 LS-WARNINGS-ISSUED PIC 9(4) VALUE 0. 01 LS-VALIDATION-WORK. 05 LS-CURRENT-RECORD PIC X(100) VALUE SPACES. 05 LS-FIELD-BUFFER PIC X(50) VALUE SPACES. 05 LS-ERROR-MESSAGE PIC X(80) VALUE SPACES. 05 LS-VALIDATION-CODE PIC 9(2) VALUE 0. 01 LS-CALCULATION-AREAS. 05 LS-TEMP-AMOUNT PIC 9(8)V99 VALUE 0. 05 LS-RUNNING-TOTAL PIC 9(10)V99 VALUE 0. 05 LS-AVERAGE-VALUE PIC 9(8)V99 VALUE 0. 05 LS-MAX-VALUE PIC 9(8)V99 VALUE 0. 05 LS-MIN-VALUE PIC 9(8)V99 VALUE 999999.99. 01 LS-CONTROL-FLAGS. 05 LS-PROCESSING-ACTIVE PIC X VALUE 'N'. 05 LS-ERROR-OCCURRED PIC X VALUE 'N'. 05 LS-VALIDATION-PASSED PIC X VALUE 'Y'. 05 LS-CALCULATIONS-DONE PIC X VALUE 'N'. 01 LS-ARRAY-WORK. 05 LS-WORK-TABLE OCCURS 50 TIMES. 10 LS-TABLE-KEY PIC X(10) VALUE SPACES. 10 LS-TABLE-DATA PIC X(30) VALUE SPACES. 10 LS-TABLE-AMOUNT PIC 9(7)V99 VALUE 0. 10 LS-TABLE-FLAG PIC X VALUE 'N'. 01 LS-EMPLOYEE-PROCESSING. 05 LS-CURRENT-EMP. 10 LS-EMP-ID PIC 9(6) VALUE 0. 10 LS-EMP-NAME PIC X(30) VALUE SPACES. 10 LS-EMP-DEPT PIC X(15) VALUE SPACES. 10 LS-EMP-SALARY PIC 9(7)V99 VALUE 0. 05 LS-DEPARTMENT-TOTALS. 10 LS-DEPT-COUNT PIC 9(4) VALUE 0. 10 LS-DEPT-TOTAL-SAL PIC 9(9)V99 VALUE 0. 10 LS-DEPT-AVG-SAL PIC 9(7)V99 VALUE 0. PROCEDURE DIVISION. MAIN-PROCESSING. *> Demonstrate automatic initialization PERFORM DEMONSTRATE-INITIALIZATION *> Call this program recursively to show LOCAL-STORAGE behavior PERFORM DEMONSTRATE-RECURSIVE-CALLS *> Show persistent vs local storage differences PERFORM DEMONSTRATE-STORAGE-DIFFERENCES *> Show practical applications PERFORM DEMONSTRATE-PRACTICAL-USAGE STOP RUN. DEMONSTRATE-INITIALIZATION. DISPLAY "=== LOCAL-STORAGE INITIALIZATION DEMO ===" DISPLAY SPACES *> Increment persistent counter ADD 1 TO WS-CALL-COUNTER DISPLAY "Program call number: " WS-CALL-COUNTER DISPLAY "LOCAL-STORAGE values at start:" DISPLAY " LS-RECORDS-PROCESSED: " LS-RECORDS-PROCESSED DISPLAY " LS-RUNNING-TOTAL: " LS-RUNNING-TOTAL DISPLAY " LS-PROCESSING-ACTIVE: " LS-PROCESSING-ACTIVE DISPLAY " LS-MIN-VALUE: " LS-MIN-VALUE *> Modify LOCAL-STORAGE values MOVE 100 TO LS-RECORDS-PROCESSED MOVE 5000.50 TO LS-RUNNING-TOTAL MOVE 'Y' TO LS-PROCESSING-ACTIVE MOVE 25.75 TO LS-MIN-VALUE DISPLAY "After modification:" DISPLAY " LS-RECORDS-PROCESSED: " LS-RECORDS-PROCESSED DISPLAY " LS-RUNNING-TOTAL: " LS-RUNNING-TOTAL DISPLAY " LS-PROCESSING-ACTIVE: " LS-PROCESSING-ACTIVE DISPLAY " LS-MIN-VALUE: " LS-MIN-VALUE DISPLAY SPACES. DEMONSTRATE-RECURSIVE-CALLS. DISPLAY "=== RECURSIVE CALL DEMONSTRATION ===" DISPLAY SPACES IF WS-CALL-COUNTER < 3 DISPLAY "Making recursive call (call " WS-CALL-COUNTER ")" DISPLAY "Current LS-RECORDS-PROCESSED: " LS-RECORDS-PROCESSED *> Set a value before recursive call MOVE 555 TO LS-RECORDS-PROCESSED DISPLAY "Set LS-RECORDS-PROCESSED to: " LS-RECORDS-PROCESSED *> Make recursive call CALL "LOCAL-STORAGE-DEMO" *> Check value after recursive call DISPLAY "After recursive call, LS-RECORDS-PROCESSED: " LS-RECORDS-PROCESSED DISPLAY "This shows LOCAL-STORAGE is reinitialized on each call" ELSE DISPLAY "Maximum recursion depth reached" END-IF DISPLAY SPACES. DEMONSTRATE-STORAGE-DIFFERENCES. DISPLAY "=== STORAGE TYPE DIFFERENCES ===" DISPLAY SPACES DISPLAY "WORKING-STORAGE (persistent between calls):" DISPLAY " WS-CALL-COUNTER: " WS-CALL-COUNTER IF WS-FIRST-CALL = 'Y' DISPLAY " This is the first call - setting WS-FIRST-CALL to 'N'" MOVE 'N' TO WS-FIRST-CALL ELSE DISPLAY " This is a subsequent call - WS-FIRST-CALL is still 'N'" END-IF DISPLAY "LOCAL-STORAGE (reinitialized on each call):" DISPLAY " LS-PROCESSING-ACTIVE: " LS-PROCESSING-ACTIVE DISPLAY " LS-ERROR-OCCURRED: " LS-ERROR-OCCURRED DISPLAY " LS-VALIDATION-PASSED: " LS-VALIDATION-PASSED *> Modify LOCAL-STORAGE flags MOVE 'Y' TO LS-PROCESSING-ACTIVE MOVE 'Y' TO LS-ERROR-OCCURRED MOVE 'N' TO LS-VALIDATION-PASSED DISPLAY "After modification:" DISPLAY " LS-PROCESSING-ACTIVE: " LS-PROCESSING-ACTIVE DISPLAY " LS-ERROR-OCCURRED: " LS-ERROR-OCCURRED DISPLAY " LS-VALIDATION-PASSED: " LS-VALIDATION-PASSED DISPLAY "Note: These LOCAL-STORAGE values will be reset on next call" DISPLAY SPACES. DEMONSTRATE-PRACTICAL-USAGE. DISPLAY "=== PRACTICAL LOCAL-STORAGE USAGE ===" DISPLAY SPACES PERFORM EMPLOYEE-PROCESSING-EXAMPLE PERFORM VALIDATION-PROCESSING-EXAMPLE PERFORM CALCULATION-PROCESSING-EXAMPLE. EMPLOYEE-PROCESSING-EXAMPLE. DISPLAY "Employee Processing with LOCAL-STORAGE:" *> Initialize current employee (automatic each call) MOVE 123456 TO LS-EMP-ID MOVE "JOHN SMITH" TO LS-EMP-NAME MOVE "SALES" TO LS-EMP-DEPT MOVE 65000.00 TO LS-EMP-SALARY *> Process department statistics ADD 1 TO LS-DEPT-COUNT ADD LS-EMP-SALARY TO LS-DEPT-TOTAL-SAL COMPUTE LS-DEPT-AVG-SAL = LS-DEPT-TOTAL-SAL / LS-DEPT-COUNT DISPLAY " Employee: " LS-EMP-NAME DISPLAY " Department: " LS-EMP-DEPT DISPLAY " Salary: $" LS-EMP-SALARY DISPLAY " Dept Statistics: Count=" LS-DEPT-COUNT " Total=$" LS-DEPT-TOTAL-SAL " Avg=$" LS-DEPT-AVG-SAL DISPLAY SPACES. VALIDATION-PROCESSING-EXAMPLE. 01 WS-TEST-RECORD PIC X(50) VALUE "TEST DATA FOR VALIDATION". 01 WS-VALIDATION-INDEX PIC 9(2) VALUE 0. DISPLAY "Validation Processing with LOCAL-STORAGE:" MOVE WS-TEST-RECORD TO LS-CURRENT-RECORD *> Simulate validation process PERFORM VARYING WS-VALIDATION-INDEX FROM 1 BY 1 UNTIL WS-VALIDATION-INDEX > 5 ADD 1 TO LS-RECORDS-PROCESSED IF WS-VALIDATION-INDEX = 3 ADD 1 TO LS-RECORDS-REJECTED MOVE "VALIDATION ERROR AT POSITION 3" TO LS-ERROR-MESSAGE MOVE 'Y' TO LS-ERROR-OCCURRED ELSE ADD 1 TO LS-RECORDS-VALIDATED END-IF IF FUNCTION MOD(WS-VALIDATION-INDEX, 2) = 0 ADD 1 TO LS-WARNINGS-ISSUED END-IF END-PERFORM DISPLAY " Records processed: " LS-RECORDS-PROCESSED DISPLAY " Records validated: " LS-RECORDS-VALIDATED DISPLAY " Records rejected: " LS-RECORDS-REJECTED DISPLAY " Warnings issued: " LS-WARNINGS-ISSUED IF LS-ERROR-OCCURRED = 'Y' DISPLAY " Error: " LS-ERROR-MESSAGE END-IF DISPLAY SPACES. CALCULATION-PROCESSING-EXAMPLE. 01 WS-TEST-VALUES. 05 WS-TEST-AMOUNTS OCCURS 5 TIMES PIC 9(5)V99 VALUE 100.50, 250.75, 75.25, 400.00, 175.30. 01 WS-CALC-INDEX PIC 9(2) VALUE 0. DISPLAY "Calculation Processing with LOCAL-STORAGE:" *> Process test amounts PERFORM VARYING WS-CALC-INDEX FROM 1 BY 1 UNTIL WS-CALC-INDEX > 5 MOVE WS-TEST-AMOUNTS(WS-CALC-INDEX) TO LS-TEMP-AMOUNT ADD LS-TEMP-AMOUNT TO LS-RUNNING-TOTAL *> Track maximum and minimum IF LS-TEMP-AMOUNT > LS-MAX-VALUE MOVE LS-TEMP-AMOUNT TO LS-MAX-VALUE END-IF IF LS-TEMP-AMOUNT < LS-MIN-VALUE MOVE LS-TEMP-AMOUNT TO LS-MIN-VALUE END-IF END-PERFORM *> Calculate average COMPUTE LS-AVERAGE-VALUE = LS-RUNNING-TOTAL / 5 MOVE 'Y' TO LS-CALCULATIONS-DONE DISPLAY " Running total: $" LS-RUNNING-TOTAL DISPLAY " Average value: $" LS-AVERAGE-VALUE DISPLAY " Maximum value: $" LS-MAX-VALUE DISPLAY " Minimum value: $" LS-MIN-VALUE DISPLAY " Calculations complete: " LS-CALCULATIONS-DONE DISPLAY SPACES PERFORM SHOW-ARRAY-WORK-EXAMPLE. SHOW-ARRAY-WORK-EXAMPLE. 01 WS-ARRAY-INDEX PIC 9(2) VALUE 0. 01 WS-SAMPLE-KEYS. 05 WS-KEY-VALUES OCCURS 5 TIMES PIC X(10) VALUE "KEY001", "KEY002", "KEY003", "KEY004", "KEY005". 01 WS-SAMPLE-DATA. 05 WS-DATA-VALUES OCCURS 5 TIMES PIC X(30) VALUE "FIRST ENTRY", "SECOND ENTRY", "THIRD ENTRY", "FOURTH ENTRY", "FIFTH ENTRY". DISPLAY "Array Work Area Example (LOCAL-STORAGE):" *> Initialize array work area (starts clean each call) PERFORM VARYING WS-ARRAY-INDEX FROM 1 BY 1 UNTIL WS-ARRAY-INDEX > 5 MOVE WS-KEY-VALUES(WS-ARRAY-INDEX) TO LS-TABLE-KEY(WS-ARRAY-INDEX) MOVE WS-DATA-VALUES(WS-ARRAY-INDEX) TO LS-TABLE-DATA(WS-ARRAY-INDEX) COMPUTE LS-TABLE-AMOUNT(WS-ARRAY-INDEX) = WS-ARRAY-INDEX * 100.25 MOVE 'Y' TO LS-TABLE-FLAG(WS-ARRAY-INDEX) DISPLAY " Entry " WS-ARRAY-INDEX ": " LS-TABLE-KEY(WS-ARRAY-INDEX) " - " LS-TABLE-DATA(WS-ARRAY-INDEX) " - $" LS-TABLE-AMOUNT(WS-ARRAY-INDEX) END-PERFORM DISPLAY "Array initialized successfully in LOCAL-STORAGE" DISPLAY "This array will be reset to initial values on next call" DISPLAY SPACES. *> ================================================== *> UTILITY SUBPROGRAM USING LOCAL-STORAGE *> ================================================== IDENTIFICATION DIVISION. PROGRAM-ID. CALC-UTILITY. DATA DIVISION. WORKING-STORAGE SECTION. 01 WS-UTILITY-VERSION PIC X(10) VALUE "1.0". 01 WS-TOTAL-CALLS PIC 9(6) VALUE 0. LOCAL-STORAGE SECTION. 01 LS-CALCULATION-STATE. 05 LS-OPERATION-TYPE PIC X(10) VALUE SPACES. 05 LS-INPUT-VALUE-1 PIC 9(8)V99 VALUE 0. 05 LS-INPUT-VALUE-2 PIC 9(8)V99 VALUE 0. 05 LS-RESULT-VALUE PIC 9(10)V99 VALUE 0. 05 LS-ERROR-CODE PIC 9(2) VALUE 0. 01 LS-PROCESSING-FLAGS. 05 LS-INPUTS-VALIDATED PIC X VALUE 'N'. 05 LS-CALCULATION-DONE PIC X VALUE 'N'. 05 LS-RESULT-VALID PIC X VALUE 'N'. LINKAGE SECTION. 01 LK-OPERATION PIC X(10). 01 LK-VALUE-1 PIC 9(8)V99. 01 LK-VALUE-2 PIC 9(8)V99. 01 LK-RESULT PIC 9(10)V99. 01 LK-STATUS PIC 9(2). PROCEDURE DIVISION USING LK-OPERATION LK-VALUE-1 LK-VALUE-2 LK-RESULT LK-STATUS. CALCULATION-MAIN. ADD 1 TO WS-TOTAL-CALLS *> Initialize LOCAL-STORAGE from parameters MOVE LK-OPERATION TO LS-OPERATION-TYPE MOVE LK-VALUE-1 TO LS-INPUT-VALUE-1 MOVE LK-VALUE-2 TO LS-INPUT-VALUE-2 PERFORM VALIDATE-INPUTS IF LS-INPUTS-VALIDATED = 'Y' PERFORM PERFORM-CALCULATION PERFORM RETURN-RESULTS ELSE MOVE 1 TO LK-STATUS END-IF GOBACK. VALIDATE-INPUTS. IF LS-OPERATION-TYPE = "ADD" OR "SUBTRACT" OR "MULTIPLY" OR "DIVIDE" IF LS-INPUT-VALUE-1 >= 0 AND LS-INPUT-VALUE-2 >= 0 MOVE 'Y' TO LS-INPUTS-VALIDATED ELSE MOVE 2 TO LS-ERROR-CODE END-IF ELSE MOVE 1 TO LS-ERROR-CODE END-IF. PERFORM-CALCULATION. EVALUATE LS-OPERATION-TYPE WHEN "ADD" ADD LS-INPUT-VALUE-1 TO LS-INPUT-VALUE-2 GIVING LS-RESULT-VALUE WHEN "SUBTRACT" SUBTRACT LS-INPUT-VALUE-2 FROM LS-INPUT-VALUE-1 GIVING LS-RESULT-VALUE WHEN "MULTIPLY" MULTIPLY LS-INPUT-VALUE-1 BY LS-INPUT-VALUE-2 GIVING LS-RESULT-VALUE WHEN "DIVIDE" IF LS-INPUT-VALUE-2 NOT = 0 DIVIDE LS-INPUT-VALUE-1 BY LS-INPUT-VALUE-2 GIVING LS-RESULT-VALUE MOVE 'Y' TO LS-RESULT-VALID ELSE MOVE 3 TO LS-ERROR-CODE MOVE 'N' TO LS-RESULT-VALID END-IF WHEN OTHER MOVE 4 TO LS-ERROR-CODE MOVE 'N' TO LS-RESULT-VALID END-EVALUATE IF LS-ERROR-CODE = 0 MOVE 'Y' TO LS-CALCULATION-DONE MOVE 'Y' TO LS-RESULT-VALID END-IF. RETURN-RESULTS. IF LS-RESULT-VALID = 'Y' MOVE LS-RESULT-VALUE TO LK-RESULT MOVE 0 TO LK-STATUS ELSE MOVE LS-ERROR-CODE TO LK-STATUS MOVE 0 TO LK-RESULT END-IF.
12345678910111213141516171819202122232425DATA DIVISION. WORKING-STORAGE SECTION. 01 WS-PERSISTENT-COUNTER PIC 9(4) VALUE 0. LOCAL-STORAGE SECTION. 01 LS-SESSION-COUNTER PIC 9(4) VALUE 0. PROCEDURE DIVISION. COUNTER-DEMO. ADD 1 TO WS-PERSISTENT-COUNTER ADD 1 TO LS-SESSION-COUNTER DISPLAY "Call results:" DISPLAY " WORKING-STORAGE counter: " WS-PERSISTENT-COUNTER DISPLAY " LOCAL-STORAGE counter: " LS-SESSION-COUNTER *> Call self recursively to demonstrate difference IF WS-PERSISTENT-COUNTER < 3 CALL "COUNTER-DEMO" END-IF. *> Expected output: *> Call 1: WS=1, LS=1 *> Call 2: WS=2, LS=1 (LS reinitialized) *> Call 3: WS=3, LS=1 (LS reinitialized again)
1234567891011121314151617181920212223242526272829303132333435363738394041DATA DIVISION. LOCAL-STORAGE SECTION. 01 LS-PROCESSING-WORK. 05 LS-RECORD-BUFFER PIC X(100) VALUE SPACES. 05 LS-VALIDATION-FLAGS. 10 LS-NAME-VALID PIC X VALUE 'N'. 10 LS-ID-VALID PIC X VALUE 'N'. 10 LS-AMOUNT-VALID PIC X VALUE 'N'. 05 LS-ERROR-COUNT PIC 9(2) VALUE 0. 05 LS-PROCESS-STATUS PIC X(10) VALUE "READY". LINKAGE SECTION. 01 LK-INPUT-RECORD PIC X(100). 01 LK-VALIDATION-RESULT PIC X(10). PROCEDURE DIVISION USING LK-INPUT-RECORD LK-VALIDATION-RESULT. PROCESS-RECORD. *> LS-PROCESSING-WORK is automatically reset to initial values MOVE LK-INPUT-RECORD TO LS-RECORD-BUFFER MOVE "PROCESSING" TO LS-PROCESS-STATUS PERFORM VALIDATE-RECORD-FORMAT PERFORM CHECK-BUSINESS-RULES IF LS-ERROR-COUNT = 0 MOVE "VALID" TO LK-VALIDATION-RESULT ELSE MOVE "INVALID" TO LK-VALIDATION-RESULT END-IF GOBACK. VALIDATE-RECORD-FORMAT. *> Validation logic that modifies LOCAL-STORAGE flags *> Each call starts with fresh 'N' values IF LS-RECORD-BUFFER(1:10) NOT = SPACES MOVE 'Y' TO LS-NAME-VALID ELSE ADD 1 TO LS-ERROR-COUNT END-IF.
How does LOCAL-STORAGE initialization work?
Answer: LOCAL-STORAGE items are automatically initialized to their VALUE clause values (or default values) each time the program is called. This happens before the PROCEDURE DIVISION begins execution.
When should you choose LOCAL-STORAGE over WORKING-STORAGE?
Answer: Choose LOCAL-STORAGE when you need guaranteed fresh data on each call, for recursive programs, in multithreaded environments, or when you want to prevent data contamination between program invocations.
What are common use cases for LOCAL-STORAGE?
Answer: Common uses include: validation routines needing clean flags, calculation modules requiring fresh work areas, recursive algorithms, utility programs called multiple times, and any processing requiring guaranteed initial state.