Tables1 TABLES (chp. 12) group of storage locations (i.e. elements) with the same name accessed by name and subscript ex. var-name (sub) similar to arrays in other languages

Tables2 Integer values from 1 to occurs clause value (specifies maximum value) Up to 7 subscripts are permitted in COBOL Subscripts are listed in parenthesis following the table name Each time the value of a subscript changes, data-name (sub) refers to a different element in the array Using a data-name as a subscript enables its contents to be varied Relative subscripting is used when what is in parenthesis can be an arithmetic expression if using subscript constants (named or literal) compiler will detect error if using subscript variables, error won't be detected until run-time Defines the number of elements in the table for each level Defines the maximum subscript for each level Up to seven levels of OCCURS permitted in COBOL Can not be used on 01 level item OCCURS Clause SUBSCRIPTS

Tables3 TABLE examples If item defined by OCCURS has PIC clause, it defines a series of elementary items 01 Totals. 05 Month-Totals Occurs 12 Times Pic 9(5)V99. For your information When a variable name has an OCCURS clause on it or above it with a smaller level number, it must have one subscript when referencing that memory location for each OCCURS.

Tables4 TABLE examples Identifier used with OCCURS may also be group item 01 Tax-Table. 05 Group-X Occurs 20 Times. 10 City Pic X(6). 10 Tax-RatePic V999.

Tables5 EXAMPLE #1 01 DAYS-OF-MONTH-TABLE. 03 MONTHS OCCURS 12 times. 05 Month-Name PIC X(15). 05 Month-Num-DaysPIC 99. Move January to Month-Name (1) Move 31 to Month-Num-Days (1) EXAMPLE #2 01 DAYS-OF-MONTH-TABLE. 05 Month-Name PIC X(15) OCCURS 12 TIMES. 05 Month-Num-DaysPIC 99 OCCURS 12 TIMES. Move January to Month-Name (1) Move 31 to Month-Num-Days (1) More TABLE examples How else initialize Month-Name and Month-Num-Days?!

Tables6 01 GRADE-TABLE. 05 QUIZ-TABLE OCCURS 40 TIMES. 10 QUIZ1 PIC 9(2). 10 QUIZ2 PIC 9(2). 10 QUIZ3 PIC 9(2). 10 QUIZ4 PIC 9(2). How do we average all the quiz scores for QUIZ4? Compute-Average-Quiz4. MOVE ZERO TO Total-Grade MOVE 1 TO Sub PERFORM UNTIL Sub > Num-Quizzes ADD QUIZ4(Sub) TO Total-Grade ADD 1 TO Sub END-PERFORM DIVIDE Total-Grade BY Num-Quizzes GIVING Average-Score One More TABLE example ***Convert to Perform-Varying

Tables7 Two ways to use VALUE clause to initialize all elements to zero: 01 Array-1Value Zero. 05 Totals Occurs 50 Times Pic 9(5). 01 Array Totals Occurs 50 Times Pic 9(5) Value Zero. Can also initialize each element to different value 01 Day-Names Value 'SUNMONTUEWEDTHUFRISAT'. 05 Days Occurs 7 Times Pic X(3). ??? Can an initialization be done on the 05 directly above??? INITIALIZE STATEMENT (i.e. in Procedure Division) A series of elementary items contained within a group item can all be initialized. Numeric items will be initialized to zero and nonnumeric items will be initialized to blank. FORMAT: INITIALIZE {identifier-1} … INITIALIZING TABLES

Tables8 REDEFINES Purpose : Used to define a field with a value clause then redefine it as an array. However, you cannot do the reverse; that is, once an entry has been defined by an OCCURS clause, it may NOT be redefined. FORMAT in Data Division: L# identifier-1 REDEFINES identifier-2 [finish declaration] where: L# means level number Identifier-1 and identifier-2 must be on the same level EXAMPLES : See table example program 01 Rates Rate PIC 99V999 value Rate REDEFINES 10Rate PIC 999V Rate REDEFINES 10Rate PIC 9999V9. Result 100Rate = and 1000Rate = HoldDate. 02 EuroDate. 03 EuroDay PIC 99 value EuroMonth PIC 99 value EuroYear PIC 9(4) value USDate REDEFINES EuroDate. 03 USMonth PIC USDay PIC USYear PIC 9(4). USMonth = 3 and USDay = 11

Tables9 Define array as follows: 01 Temperature-Array. 05Day-In-Week Occurs 7 Times. 10 Hour Occurs 24 Times. 15 TempPic 9(3). 2 dimensional TABLES (ex#1) For your information : If reading in from file, what does input file look like?! FD input file 01 input-rec pic 999. Find the average temp for: each day. Find the average temp for each hour. PARTICIPATION POINTS (5) (due in one week – graded on if works!) What if have negative temperatures? How solve?! That is, what does input file look like? What does declaration look like? Perform a from 1 by 1 until a > 7 perform b from 1 by 1 until b > 24 read input-file at end.. move input-rec to temp (a b) end-perform End-perform

Tables10 2 dimensional TABLES (ex#2) 01 Jeans-Table. 05 Jean-Gender OCCURS 2 TIMES. 10 Jean-Color OCCURS 3 TIMES. 15 Jean-SalesValue PIC 9(8)V Jean-NumSold PIC 9(7).

Tables11 2 dimensional TABLES (ex#3) 01 Jeans-Table. 05 Jean-Size OCCURS 10 TIMES. 10 Exact-Size PIC Jean-Style PIC X. 10 Jean-Color OCCURS 3 TIMES. 15 Jean-SalesValue PIC 9(8)V Jean-NumSold PIC 9(7).