INFORMATION TECHNOLOGY
PAPER 1
GRADE 12 
AMENDED SENIOR CERTIFICATE EXAMS
PAST PAPERS AND MEMOS
MAY/JUNE 2018

INSTRUCTIONS AND INFORMATION 

1.  This question paper is divided into THREE sections. Candidates must answer  ALL the questions in each of the THREE sections. 
2. The duration of this examination is three hours. Because of the nature of this  examination it is important to note that you will not be permitted to leave the  examination room before the end of the examination session. 
3. This question paper is set with programming terms that are specific to the  Delphi programming language. 
4. Make sure that you answer the questions according to the specifications that  are given in each question. Marks will be awarded according to the set  requirements. 
5. Answer only what is asked in each question. For example, if the question  does not ask for data validation, then no marks will be awarded for data  validation. 
6. Your programs must be coded in such a way that they will work with any data  and not just the sample data supplied or any data extracts that appear in the  question paper. 
7. Routines, such as search, sort and selection must be developed from first  principles. You may NOT use the built-in features of Delphi for any of these  routines. 
8. All data structures must be defined by you, the programmer, unless the data  structures are supplied. 
9.  You must save your work regularly on the disk/CD/DVD/flash disk you have  been given, or on the disk space allocated to you for this examination  session.
10. Make sure that your examination number appears as a comment in every  program that you code, as well as on every event indicated.
11. If required, print the programming code of all the programs/classes that you  completed. You will be given half an hour printing time after the examination  session.
12. At the end of this examination session you must hand in a disk/CD/DVD/ flash disk with all your work saved on it OR you must make sure that all your  work has been saved on the disk space allocated to you for this examination  session. Ensure that all files can be read.
13. The files that you need to complete this question paper have been given to  you on the disk/CD/DVD/flash disk or on the disk space allocated to you. The  files are provided in the form of password-protected executable files. 

NOTE:  
Candidates must use the file DataENGJune2018.exe. 
Do the following: 

• Double click on the password-protected executable file. 
• Click on the extract button. 
• Enter the following password: Bks18@Lib*#? 

Once extracted, the following list of files will be available in the folder  DataENGJune2018: 
SUPPLIED FILES 
Question1:  

• Question1_P.dpr 
• Question1_P.dproj
• Question1_P.res
• Question1_U.dfm
• Question1_U.pas 

Question2: 

• Book_U.pas
• BooksData.txt
• BooksDataBackup.txt
• Question2_P.dpr
• Question2_P.dproj
• Question2_P.res
• Question2_U.dfm
• Question2_U.pas 

Question3: 

• Question3_P.dpr
• Question3_P.dproj
• Question3_P.res
• Question3_U.dfm
• Question3_U.pas

QUESTIONS 

SECTION A 
QUESTION 1: GENERAL PROGRAMMING SKILLS 
Do the following: 

• Open the incomplete program in the Question1 folder. 
• Enter your examination number as a comment in the first line of the  Question1_U.pas file. 
• Compile and execute the program. The GUI displays FIVE sections labelled  QUESTION 1.1 to QUESTION 1.5. Currently the program has no functionality. 

The following user interface is displayed: 

• Follow the instructions below to complete the code for EACH section of  QUESTION 1, as described in QUESTION 1.1 to QUESTION 1.5. 

1.1 OnCreate Event [Question 1.1] 
Write code in the 'OnCreate' event handler of the Form to change the text  displayed on the pnlQ1_1 panel as follows when the program is executed: 

• Assign the existing text from the panel to a variable. 
• Add a dash ('-') and use the relevant function to also add the system date  to the text. 
• Change the text to upper case and display the text in bold.  

Example of output: 

NOTE: The format of the system date may differ from the example. (6)
1.2 Button [1.2 - Display] 
Write code using the loop counter variable cCounter and a loop to compile  a string containing the letters 'Z' to 'R' in the variable sOutput. Assign the  variable to the edit box to display. 
Example of output: 
(6) 
1.3 The time it takes a student to read a textbook depends on the total number of  words the textbook contains and whether the content is of a technical nature  or not.  
1.3.1 Button [1.3.1 - Total number of words] 
The average number of words per page in a textbook of standard  size has been declared as 300 in a constant variable called  WordsPerPage.  
The user needs to select the number of pages the book contains  from the spin edit component. 
Complete the provided code to do the following: 

• Declare an integer variable for the number of pages. 
• Obtain the value of number of pages from the spin edit component. 
• Use the constant variable and the number of pages to calculate  the total number of words.  
• Display the total number of words in the edit box provided. 

NOTE: The variable iTotalNumWords has been declared as a  global variable to be used again in QUESTION 1.3.2. 
Example of output: 
(5)
1.3.2 Radio group [1.3.2 – Type of book] 
Research shows that a student can read a literature book at  the speed of 250 words per minute and a technical book at the  speed of 75 words per minute. These values have been declared  as constant values using the variables WordsLit and WordsTech respectively. The user needs to select the type of book from the  radio buttons provided. 
Write code to do the following to determine the time it should take a student to read the book: 

• Determine the type of book that has been selected. 
• Use the global variable iTotalNumWords and the relevant  constant variable to calculate the time (in minutes) it would  take a student to read the book. 
• Display the time in edit box edtTimeInMinutes provided. 

NOTE: If you were not able to calculate the total number of  pages in QUESTION 1.3.1, assign a value of 33 600 to the global variable iTotalNumWords to be able to do  
QUESTION 1.3.2. 
Example of output if the book is a technical book and has 112 pages, which results in 33 600 words, as calculated in QUESTION 1.3.1: 

Example of output if the book is a literature book and has 112 pages, which results in 33 600 words, as calculated in  QUESTION 1.3.1: 
(7)
1.4 Combo box [cmbQ1_4] 
The user needs to select a password from the combo box cmbQ1_4 which  contains a number of encrypted passwords. 
Write code to decrypt the selected password according to the instructions  below. 

• The first two characters of the password must be moved to the end of the  password. 
• If the password contains a hash character (#), replace it with a dollar  character ($), followed by a full stop (.). 

Example of output if the password os3%!ko has been selected: 

Example of output if the password ay7#@tod has been selected:
(13) 
1.5 Button [1.5 - Coordinates] 
The formula for a straight line is y = mx + c. The formula must be used to  calculate the value of the y-coordinate of the straight line if the value of x is  entered by the user. 
The values of 3 and -2 will be used as the values for m and c in the formula and has been assigned to the variables iM and iC respectively in the  code provided. 

Write code to display the (x,y) coordinates of a straight line in the output area  using the following instructions: 

• Clear the output area. 
• Display the heading 'Coordinates' followed by a blank line. 
• Obtain the value of x that was entered from edit box edtQ1_5.  
• Calculate the value of y using the formula y = mx + c. 

Example of the calculation of y if the value 7 is entered for x: 

y = mx + c  
= 3(7) +(-2)  
= 19 

• Display the values of coordinates x and y in the output area in  the format shown in the example below, for example (x,y) = (7,19) for the  first coordinate. 
• Decrease the value of x by 2 and repeat the previous two steps  (calculate the value of y and display the coordinates) until the value of y is equal to zero (0) or is a negative value. 

Example of output if the value of 7 was entered for the value of x: 

Example of output if the value of 12 was entered for the value of x: 
(13) 

Related Items

TOTAL SECTION A: 50

SECTION B 
QUESTION 2: OBJECT-ORIENTATED PROGRAMMING 

Do the following: 

• Open the incomplete project file called Question2_P.dpr in the Question2 folder. • Add your examination number as a comment in the first line of both the Question2_U.pas and Book_U.pas files. 
• Compile and execute the program. Currently the program has limited functionality. The following GUI is displayed when the program is executed: 
  
• Complete the code as described in QUESTION 2.1 and QUESTION 2.2 below. 

2.1 Complete the code in the TBook object class provided, as described in  QUESTION 2.1.1 to QUESTION 2.1.7 that follow. 
2.1.1 Declare the attributes of the class using the information in the table  below.   (4)

2.1.2 Write code to create a constructor which receives THREE  parameter values (the title, the catalogue number of the book and  the number of copies of the book that the library owns) and  initialises the relevant attributes using the parameter values.  The attribute for the number of copies of the book out (currently  borrowed) must be initialised to zero. (5) 
2.1.3 Write an accessor method getCatalogueNumber for the catalogue  number attribute of the book. (2) 
2.1.4 Write an accessor method getNumBooksOut for the number of  books out attribute. (2) 
2.1.5 Write code for a mutator method setNumBooksOut to receive an  integer as a parameter and set the fNumBooksOut attribute to the  parameter value. (3) 
2.1.6 Write code for a method called isBookAvailable that returns  a Boolean value. This method must use the fNumBooks and  fNumBooksOut attributes to determine whether a copy of the book is currently available in the library or not. The return value must be true if a book is available or false if not  available. (3) 
2.1.7 Write code to create a toString method to return a string formatted  as follows: 
The library owns < number of copies owned> copies of the book titled <book title> [<catalogue number>]. 
The number of copies currently out is <number of copies of  the book currently borrowed>. (5) 
Do the following to complete the code for Buttons 2.2.1, 2.2.2 and 2.2.3 in the  main form unit, as described below. 
2.2.1 Button [2.2.1 - Instantiate book object] 
The user needs to select the catalogue number of the book from the  combo box. Code has been provided to show the title and the  number of copies of the selected book that the university owns in the  relevant edit boxes. 
Write code to do the following: 

• Extract the required data items from the relevant components  and instantiate a new objBook object.
• Call the toString method to display the details of the object in  the output area provided. 
• Activate the Update data button. 

Example of output for the book if catalogue number G292.6 has  been selected and the object has been instantiated:  

2.2.2 Button [2.2.2 - Update data] 
A text file BooksData.txt contains the records of books that were  borrowed and returned during a research week. 
The data in the text file is saved in the following format: 

<catalogue number of book>#<a character indicating  whether the book was borrowed (B) or returned (R)> 

Example of the first six lines of data in the BooksData.txt text file: 

The text file must be used to determine the number of copies of the  selected book that were borrowed and returned during the research  week. (8) 
Write code to do the following: 

• Test whether the text file BooksData.txt exists or not. Display a  suitable message if the text file does not exist and exit the event  handler. 
• Do the following if the text file exists:
  • Use a loop and search the text file for all instances of the  catalogue number of the book object. 
  • Determine how many times the book has been borrowed  (''B'') and returned (''R'') and use these values to determine  the number of copies currently out of the library using the  formula: 
    BooksOut = Number borrowed – Number returned 
  • Call the setNumBooksOut method and use the BooksOut value as the argument.
  • Call the toString method to display the updated details of  the book object in the output area provided.
  • Activate the Process request button. 

Example of output for the Update data button if catalogue number  G292.6 has been selected by the user and an object of this book  has been instantiated: 
(20) 
2.2.3 Button [2.2.3 - Process request] 
Special requests to borrow books from the research wing can be  granted if copies of the book are available. Students who did not  return books that they borrowed during the research week are also  allowed to return the books. 
The radio group component must be used to select to either borrow  or return the selected book. If the request to borrow or return the  selected book has been granted, the text file BooksData and the  object details of the book must be updated.
Write code for the following algorithm to process the borrow or return  request for the selected book: 

NOTE: A Restore text file button has been provided that can be  used to restore the content of the BooksData text file if the  content of the BooksData text file becomes corrupted  while testing your code. This will copy the data in the  BooksDataBackup text file to the BooksData text file.  
Example of output if a student requested to borrow the book titled  Basic Mathematics if copies of this book are available to be  borrowed: 

The following updated data should be displayed in the output area: 

Example of output if a student requested to borrow the book titled  Basic Mathematics if no copy of this book is available to be  borrowed:

Example of output if a student requested to return the book titled  Basic Mathematics:  

The following updated data should be displayed in the output area: 

Example of output if there is a request to return the book titled  Coding in Objects with catalogue number C284.3. All the copies of  this book have been returned. Therefore the request is invalid. 
(18) 

• Ensure that your examination number has been entered as a comment in the first  line of the class file and the form. 
• Save your program. 
• Print the code contained in both the class file and form, if required.

TOTAL SECTION B: 70

SECTION C 
QUESTION 3: PROBLEM-SOLVING PROGRAMMING 

Do the following: 

• Compile and execute the program in the Question3 folder. Currently the program  has no functionality.  
• Complete the code for each section of the question as described in QUESTION 3.1  to QUESTION 3.3. 

Supplied GUI: 
The GUI below represents an interface used by the manager of the library to allocate  duties shifts to staff members.  

The following code has been provided: 

• An array called arrStaff which contains the names of the six staff members. 
  arrStaff: array [1 .. 6] of String = 
  ('Trevor','Nkosi','Tamzin','Anette','Bongi','Simon'); 
• The declaration of a two-dimensional array called arrPlacements that will be used  to store the names of staff members according to the days they will be on duty  (columns 1 to 6) in each library (rows 1 to 3): 
  arrPlacements: array [1 .. 3, 1 .. 6] of String = 
  (('Nkosi', 'Simon','Anette', 'Bongi', 'Tamzin', 'Trevor'), 
  ('Anette', 'Tamzin','Simon', 'Trevor', 'Bongi', 'Nkosi'), 
  ('Bongi', 'XXXXX', 'Trevor','Nkosi', 'Nkosi', 'Tamzin'));
• A completed Display procedure that will display the schedule of staff placements  (content of arrPlacements). 

Example of the output of a schedule that will be displayed when the display  procedure is called to display the content of arrPlacements. Library 3 can be  closed on any day, as decided by the manager. For this schedule, the manager  has decided to close Library 3 on Day 2, which is represented by 'XXXXX' in array  arrPlacements. 

The row and column headings are not part of the content of the two-dimensional  array provided. 
NOTE: 

• You are NOT allowed to modify supplied data manually. Code must be written to  manipulate the supplied data according to the requirements. 
• The use of good programming techniques and modular design must be applied in  the design and coding of your solution. 
• NO marks will be awarded for the use of hardcoding to populate array  arrPlacements. 

3.1 Combo box [3.1 - Select name] 
A staff member may request a schedule of his/her duties. 
When a name is selected from the combo box cmbStaff, the following  information must be displayed in the output component provided: 

• A heading with the name of the staff member 
• The work schedule details of the selected staff member  

The format of the work schedule details is as follows: 
Day <day number>-Library#<library number> 
Example of output if staff member Tamzin was selected from cmbStaff: 

Example of output if staff member Nkosi was selected from cmbStaff: 
(10) 
3.2 Button [3.2 - Create new schedule] 
A one-dimensional array called arrStaff is provided and must be used to  create a new schedule for staff members. The new schedule must be saved in  the two-dimensional array arrPlacements.  
Write code to compile a new placement schedule for staff members by  populating the arrPlacements array with the names of staff members as  follows: 
Library 1: Each staff member will be placed on duty according to the order of the appearance of their names in the array arrStaff. The first staff  member in the array will be assigned to Day 1, the second staff  member to Day 2 and so on. 

Library 2: Each staff member will be placed on duty in the reverse order of  the contents of the array arrStaff. The first staff member in the  array will be assigned to Day 6, the second staff member to Day 5  and so on: 

Library 3: Write code to use an input box to prompt the manager to enter  a day number (1 to 6) on which Library 3 will be closed.  Array arrPlacements must show 'XXXXX' for the day the library is  closed. The staff will be allocated randomly for the remainder of  the days to this library. A test must be done to ensure that the staff  member randomly selected for Library 3 is not already allocated to  Library 1 or Library 2 for that day.
Example of output if the manager entered Day 3 for Library 3 to be closed: 
(20) 

TOTAL SECTION C: 30 
GRAND TOTAL: 150