1. Screen I/O
ACCEPT
DISPLAY
Relevant to the Fujitsu Compiler

2. Ch 11- Tables Introduction to tables OCCURS clause Processing a table
Not permitted at the 01 level
Use parenthesis to get the actual data
Processing a table
Brute force
Does not take advantage of the table structure
PERFORM…VARYING
Repeated execution of statements
Initializes a variable and tests a condition repeatedly

3. Figure 11.1 The Table Concept
01 ANNUAL-SALES-DATA JAN-SALES PIC 9(6) FEB-SALES PIC 9(6) MAR-SALES PIC 9(6) APR-SALES PIC 9(6) MAY-SALES PIC 9(6) JUN-SALES PIC 9(6) JUL-SALES PIC 9(6) AUG-SALES PIC 9(6) SEP-SALES PIC 9(6) OCT-SALES PIC 9(6) NOV-SALES PIC 9(6) DEC-SALES PIC 9(6).
(a) Brute Force
01 ANNUAL-SALES-DATA SALES OCCURS 12 TIMES PIC 9(6).
(b) OCCURS Clause
ANNUAL-SALES-DATA
SALES (1)
SALES (2)
SALES (12)
(c) Storage Schematic

4. Figure 11.2 PERFORM VARYING (with TEST BEFORE)
Initialize identifier-1
to FROM value
Evaluate
condition=1
Perform
procedure-1
or imperative-
statement
Increment
identifier-1
with BY value
TRUE
FALSE

5. Figure 11.3 Processing a Table
MOVE ZERO TO ANNUAL-TOTAL. PERFORM INCREMENT-ANNUAL-TOTAL VARYING SALES-SUB FROM 1 BY 1 UNTIL SALES-SUB > INCREMENT-ANNUAL-TOTAL. ADD SALES (SALES-SUB) TO ANNUAL-TOTAL.
(a) Performing a Paragraph
MOVE ZERO TO ANNUAL-TOTAL. PERFORM VARYING SALES-SUB FROM 1 BY 1 UNTIL SALES-SUB > 12 ADD SALES (SALES-SUB) TO ANNUAL-TOTAL END-PERFORM.
(b) In-line Perform

6. Example Occurs clause At group level At elementary level Problems with
If using occurs clause then use parenthesis
Compilation errors
Execution errors
Does not check if data exists in a subscript

7. Figure 11.4 OCCURS Clause at the Group Level
05 SALARY-DATA OCCURS 3 TIMES. 10 SALARY PIC 9(6)V SAL-DATE PIC 9(4).
(a) COBOL Statements
SALARY-DATA (1)
SALARY (1)
SAL-DATE (1)
SALARY-DATA (2)
SALARY (2)
SAL-DATE (2)
SALARY-DATA (3)
SALARY (3)
SAL-DATE (3)
(b) Storage Schematic

8. Figure 11.5 OCCURS Clause at the Elementary Level
05 SALARY-DATA SALARY OCCURS 3 TIMES PIC 9(6)V SAL-DATE OCCURS 3 TIMES PIC 9(4).
(a) COBOL Statements
SALARY (2)
SAL-DATE (2)
SALARY-DATA
SALARY (1)
SAL-DATE (1)
SAL-DATE (3)
SALARY (3)
(b) Storage Schematic

9. Figure 11.6 Relative Subscripting
CURRENT SALARY EFFECTIVE DATE PERCENT INCREASE
$46, / % $40, / % $36, / % $32, /90
(a) Salary History
PERFORM VARYING SUB FROM 1 BY 1 UNTIL SUB > 3 OR SALARY (SUB + 1) = COMPUTE PCT-SALARY-INC (SUB) = 100 * ((SALARY (SUB) - SALARY (SUB+1)) / SALARY (SUB + 1) END-COMPUTE END-PERFORM
(b) Computation of Percent Salary Increase

10. Relative subscripts Using the subscript to refer to different fields.
OCCURS DEPENDING ON
Saves room when reserving space in memory

11. Figure 11.7 Variable-length Records
FD STUDENT-TRANSCRIPT-FILE RECORD CONTAINS 42 TO 1131 CHARACTERS DATA RECORD IS STUDENT-RECORD. 01 STUDETN-RECORD ST-NAME PIC X(30) ST-MAJOR PIC X(10) ST-COURSES-COMPLETED PIC 99.
05 ST-COURSE-INFO OCCURS 0 TO 99 TIMES DEPENDING ON ST-COURSES-COMPLETED ST-COURSE-NUMBER PIC 9(6) ST-GRADE PIC X ST-COURSE-DATE PIC 9(4).

12. Student transcript program
Specifications
Hierarchy chart
Pseudocode
Completed program

13. Indexes versus subscripts
Occurrence
Initialization (MOVE)
Incrementing (ADD)
Arithmetic permitted in COBOL-85
Use in PERFORM statements

14. Indexes Displacement Initialization (SET) Incrementing (SET)
Arithmetic permitted
Use in PERFORM statements

15. How many times will PARAGRAPH-A be executed?
PERFORM PARAGRAPH-A
VARING SUBSCRIPT FROM 1 BY 1
UNTIL SUBSCRIPT > 5
WITH TEST BEFORE
UNTIL SUBSCRIPT = 5

16. Are these valid entries of the occurs clause
TABLE-ENTRY OCCURS 4 TIMES.
TABLE-ENTRY OCCURS 4.
TABLE-ENTRY OCCUES 3 TO 30 TIMES
DEPENDING ON NUMBER-OF-TRANS.
TABLE-ENTRY OCCURS 5 TIMES
SUBSCRIPTED BY TABLE-SUBSCRIPT.

17. How many storage positions are allocated for each of the following and show a schematic of storage assignment.
01 STATE-TABLE.
05 STATE-NAME OCCURS 50 TIMES PIC X(15).
05 STATE-POP OCCURS 50 TIMES PIC 9(8).

18. How many storage positions are allocated for each of the following and show a schematic of storage assignment.
01 STATE-TABLE.
05 NAME-POP OCCURS 50 TIMES.
10 STATE-NAME PIC X(15).
10 STATE-POP PIC 9(8).

19. Write the record statement that will define a table that contains:
1. Student-Name
2. Up to 20 Courses with the following:
3. Course-Number
4. Course-Grade
5. Course-Credits
Using the occurs clause

20. Write the code to determine the largest and smallest population
Write the code to determine the largest and smallest population. Move the values to BIGGEST and SMALLEST and the names to BIG-STATE & SMALL-STATE. Assume a variable SUBSCRIPT exists.
01 POPULATION-TABLE.
05 POPULATION-AND-NAME OCCURS 50 TIMES.
10 POP PIC 9(8).
10 STATE PIC X(15).