MOH

• software development life cycle
• Requirements Analysis phase
• Design phase
• Implementation phase
• Testing phase
• Release phase
• Maintenance phase

• What the customer(s) want
• identify problems to be solved
• focus on what not how
• End result: functional specification document
• reviewed by customer, designers

before design phase

• focus on how
• break up the problem into smaller pieces
• decide how each component work and how they work together
• end result: design specification
• reviewed by designers and implementers

• not writing code
• after requirements analysis, before implementation

• Write the code according to the design
• often the shortest phase
• end result: program code
• Reviewed by designers, coders, testers

after design, before testing

• Verify the code works according to the functional specification
• look for corner cases
• End result: test plan, program that works
• Reviewed by designers, coders and testers

after implementation, before release

• Working closely with customers
• Validate customer expectations
• Get feedback for next version
• Maintenance of this program
• End result:happy customers, $$

after testing, before maintenance

• Virtual Storage Access Method
• high performance access method and data set organization
• organizes and maintains data via a catalog structure
• VSAM are the logical datasets for storing records.
• Files can be read sequentially and randomly in VSAM.
• allows data set sharing in both batch and online environment.
• cannot be stored on TAPE volume
• always stored on DASD space.

• PERFORM procedure-name.
• PERFORM procedure-name UNTIL condition
• PERFORM  [UNTIL condition]         (inline)
•    statement 1
•    statement 2
• END-PERFORM
• PERFORM pro-name THRU pro-name-exit

• READ file-name
•     AT END statement
• END-READ

• READ INPUT-FILE
•    AT END MOVE 'NO' TO DATA-REMAINS-SW
• END-READ

• MOVE SPACES TO ENTIRE-NAME.
• STRING FNAME DELIMITED BY SPACE
•    ' ' DELIMITED BY SIZE
•    MID-INIT DELIMITED BY SPACE
•    ' ' DELIMITED BY SIZE
•    LNAME DELIMITED BY SPACE
• INTO ENTIRE-NAME.

INITIALIZE all numeric to 0's all alphanum to spaces.

INITIALIZE GROUP-ITEM - for all items in group

INITIALIZE GROUP-ITEM REPLACING NUMERIC BY ZERO

INITIALIZE GROUP-ITEM REPLACING ALPHANUMERIC BY SPACES

• 05 SC-NUM         PIC 9(9).
• 05 SC-NUM-OUT PIC 999B999B999

• MOVE SC-NUM TO SC-NUM-OUT.
• INSPECT SC-NUM-OUT REPLACING ALL ' ' BY '-'.

INSPECT FIELD-W-BLANKS REPLACING LEADING ' ' BY '0'.

• MOVE SPACES INTO NAME-IN-PIECES.
• UNSTRING ENTIRE-NAME DELIMITED BY ' '
•   INTO FNAME MID-INIT LNAME.

• IF identifier IS [NOT] NUMERIC
•                                ALPHABETIC
•                                ALPHABETIC-UPPER
•                                ALPHABETIC-LOWER
•                                ALPHANUMERIC ?
• NUMERIC allows only 0-9, not ,.$' '
• ALPHABETIC allows A-Z and ' '

• IF identifier or expression
•          IS [NOT] POSITIVE
•                       NEGATIVE
•                       ZERO

• 88-level entry
• condition name defined in the DATA Division
• for elementary items only

• 05 YEAR-CODE    PIC 9.
•   88 FRESHMAN   VALUE 1.
•   88 SOPHOMORE VALUE 2.
•   88 JUNIOR        VALUE 3.
•   88 SENIOR       VALUE 4.
•   88 GRAD-STU   VALUES ARE 5 THRU 8.
•   88 LOWER-CLASS VALUES ARE 1, 2.
•   88 UPPER-CLASS VALUES ARE 3, 4.
•   88 VALID-CODES  VALUES ARE 1 THRU 8.

• IF FRESHMAN
•    PERFORM ...
• END-IF.
• ...

• IF SALARY > 30000 AND < 40000
•   ...
• END-IF.       (same var diff relation)

• IF DEPT = 10 OR DEPT = 20.
•   ...
• END-IF.        (same var and relation)
• Implied Conditions.

• NEXT clause directs control to the statement following the period in an IF statement.
• No longer needed with END-IF. in COBOl-85.

• ACCEPT identifier FROM DAY-OF-WEEK
•                                  DATE
•                                  DAY
•                                  TIME
• DAY-OF-WEEK=1-7 meaning MON-SUM
• DATE=yymmdd
• DATE=yyddd   (Julian date)
• TIME=hhmmsshh(hr, min, sec, hundreds of sec)

• 01  TODAYS-DATE.
•   05 TODAYS-YEAR     PIC 99
•   05 TODAYS-MONTH  PIC 99
•   05 TODAYS-DAY      PIC 99
• ACCEPT TODAYS-DATE FROM DATE.
•   can do COMPUTE with these