UNIVERSITY OF THE FREE STATE DEPARTMENT OF COMPUTER SCIENCE AND INFORMATICS CSIS1614. DATE: 5 March 2015 MARKS: 100 SECTION A (36)

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1 UNIVERSITY OF THE FREE STATE DEPARTMENT OF COMPUTER SCIENCE AND INFORMATICS CSIS1614 DATE: 5 March 2015 MARKS: 100 ASSESSOR: Prof. P.J. Blignaut TIME: 180 minutes MODERATOR: Dr. L. de Wet SECTION A (36) Answer the following questions on the answer sheet that is provided. The computer must be switched off while you are busy with Section A. Draw a CROSS over the correct option on the answer sheet: 1. Which one of the following people is considered to be the first programmer? a. Konrad Zuse b. Ada Lovelace c. Charles Babbage d. Steve Jobs 2. Which one of the following is a compact and informal high-level description of an algorithm that uses the structural conventions of a programming language, but is intended for human reading rather than machine reading? a. Visual Basic b. Pseudocode c. Visual Studio d. C# 3. How many bits are there in a byte? a. 1 b. 4 c. 12 d Which one of the following is NOT a programming language? a. Delphi b. C++ c. C# d. Pascal 5. Which one of the following is not an IDE? a. Delphi b. Visual Studio c..net d. CSEC

2 2 6. The IEEE1394 standard for communication is popularly known as a. USB b. Serial c. Firewire d. SCSI 7. The standard layout of a keyboard as we use it today is generally known as: a. QWERTY b. ASCII c. EBCDIC d. ASDFG 8. Which one of the following refers to the information that is produced by a computer program? a. Output b. Throughput c. Downput d. Input 9. A parallel port connects peripherals through a. wires that run in parallel b. bytes that is transferred in parallel c. parallel switches d. parallel keys 10. What does CPU stand for? a b c d Central Processing Unit Core Processing Unit Central Processed Uniform Core Processed Unit 11. Which one of the following conventions requires variable names to be prefixed with an indication of the type or class of the variable? a. Camel case b. Pascal convention c. Hungarian notation d. Prefix convention 12. Which one of the following would not be an acceptable prefix for a picture box component? a. picbox b. pic c. pcbx d. image 13. A user is a person who creates software. 14. The Motherboard is a large rectangular board that connects the components of the computer. 15. Pascal case is a special requirement that the first letter of variable names must be lower case.

3 3 16. The Microsoft.NET framework includes a large library of coded solutions to common programming problems. 17. Machine code is a set of instructions that is executed directly by the Motherboard. 18. In computing terms, an object is a discrete bundle of programming code that relates to a particular real-world concept. 19. A hard disk drive is a volatile storage device that stores digitally encoded data. 20. An optical disc drive is a drive that uses light or electromagnetic waves in the process of reading or writing data to or from optical discs. For the following questions you should show all calculations or explain your thinking: 21. Convert to decimal: (2) 22. Convert to decimal: 3AD 16 (2) 23. Convert to binary: (2) 24. Convert to binary: 4A 16 (2) 25. Convert to hexadecimal: (2) 26. Determine in binary: (2) Write down the answer only: 27. Using the UTF table, what will the hexadecimal be for: "Hi!" (2) 28. Use the UTF table to sort the following strings in alphabetical order: (2) "John" "thank you" "Abel" "darkness" "1 April 2015" " Llewellyn" Dec Hex A B C D E F Bin sp! # $ % & ( ) * +, -.. / : ; < = >? 64 4 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _` ` a b c d e f g h i j k l m n o p q r s t u v w x y z } ~ , ˆ Š Œ š œ ž Ÿ 160 A 1010 ª «176 B 1011 ± ² ³ µ ¹ º» ¼ ½ ¾ 192 C 1100 À Á Â Ã Ä Å Æ Ç È É Ê Ë Ì Í Î Ï 208 D 1101 Ð Ñ Ò Ó Ô Õ Ö Ø Ù Ú Û Ü Ý Þ ß 224 E 1110 à á â ã ä å æ ç è é ê ë ì í î ï 240 F 1111 ð ñ ò ó ô õ ö ø ù ú û ü ý þ ÿ NB. You must submit Section A before you may switch on the computer to do Section B.

4 4 SECTION B (64) Create a folder for CSIS1614 on the T-drive. Note that this is not an open-book test. Question 1 Use CSEC to develop a Console application to provide the following output: Save your program as T:\CSIS1614\Studentnumber_Surname_Question1.cs. [8] Question 2 Use CSEC to develop a Console application. Save your program as T:\CSIS1614\Studentnumber_Surname_Question2.cs. The user must be prompted to enter binary number containing 4 bits. The program must then calculate and display the decimal equivalent of the binary number. [12] Question 3 Use CSEC to develop a Forms application to allow the user to enter three numbers in three text boxes and then display the average in a message box, formatted to two decimal digits. [32] Question 4 Develop a C# program in Notepad to prompt a user for a number of miles and then calculate the equivalent number of kilometres. There are 1.61 kilometres in a mile. Format the output to two decimal digits. You will not get marks for it, but you could use the CSC compiler to compile and test your program. You may not copy the program to or from Visual Studio or CSEC. [12]

5 5 ANSWER SHEET Student number: Name and surname: Make a cross over the correct option, e.g. b 1. a b c d 2. a b c d 3. a b c d 4. a b c d 5. a b c d 6. a b c d 7. a b c d 8. a b c d 9. a b c d 10. a b c d 11. a b c d 12. a b c d 13. True False 14. True False 15. True False 16. True False 17. True False 18. True False 19. True False 20. True False Show all calculations or explain your thinking: Write down the answer only:

6 6 MEMORANDUM Section A 1. b 2. b 3. d 4. a 5. c 6. c 7. a 8. a 9. a 10. a 11. c 12. d 13. False 14. True 15. False 16. True 17. False 18. True 19. False 20. True 21. Convert to decimal: = = Convert to decimal: 3AD 16 3x x = = Convert to binary: /2 = 120 rem 0 120/2 = 60 rem 0 60/2 = 30 rem 0 30/2 = 15 rem 0 15/2 = 7 rem 1 7/2 = 3 rem 1 3/2 = 1 rem 1 1/2 = 0 rem 1 Thus = Convert to binary: 4A Groups of Convert to hexadecimal: Groups of " Llewellyn" "1 April 2015" "Abel" "John" "darkness" "thank you"

7 7 Section B Question 1 (8) /* */ Student number : Student name and surname : P Blignaut Program type : Console Exercise number : Test 1, Section B, Question 1 using System; public class CProgram public static void Main() Console.WriteLine("\\ /"); Console.WriteLine("/ \\"); Console.WriteLine("// \\\\"); Console.WriteLine("// \\\\"); Console.WriteLine(" =\"="); Console.Write("\nPress any key to exit..."); Console.ReadKey(); } //End of Main } //End of class Question 2 (12) /* */ Student number : Student name and surname : P Blignaut Program type : Console Exercise number : Test 1, Section B, Question 2 using System; public class CProgram public static void Main() //Input Console.Write("\n\n\tBinary number with 4 bits : "); int ibin1 = Console.Read() - 48; int ibin2 = Console.Read() - 48; int ibin3 = Console.Read() - 48; int ibin4 = Console.Read() - 48; //Processing int idecimal = ibin1 * 2 * 2 * 2 + ibin2 * 2 * 2 + ibin3 * 2 + ibin4; //Output Console.WriteLine("\tEquivalent decimal : " + idecimal ); Console.Write("\n\tPress any key to exit... "); Console.ReadKey(); } //End of Main } //End of class

8 8 Question 3 (32) /* */ Student number : Student name and surname : P Blignaut Program type : Forms Exercise number : Section B, Question 3 using System; using System.Drawing; using System.Windows.Forms; public class CProgram static TextBox txtnumber1, txtnumber2, txtnumber3; //Main method public static void Main() //Declare and instantiate form Form frmmain = new Form(); frmmain.startposition = FormStartPosition.CenterScreen; //Label and textbox 1 Label lblnumber1 = new Label(); lblnumber1.parent = frmmain; lblnumber1.text = "Number 1"; lblnumber1.autosize = true; lblnumber1.left = 20; lblnumber1.top = 20; txtnumber1 = new TextBox(); txtnumber1.parent = frmmain; txtnumber1.left = 20; txtnumber1.top = lblnumber1.top + lblnumber1.height; //Label and textbox 2 Label lblnumber2 = new Label(); lblnumber2.parent = frmmain; lblnumber2.text = "Number 2"; lblnumber2.autosize = true; lblnumber2.left = 20; lblnumber2.top = txtnumber1.top + txtnumber1.height + 4; txtnumber2 = new TextBox(); txtnumber2.parent = frmmain; txtnumber2.left = 20; txtnumber2.top = lblnumber2.top + lblnumber2.height; //Label and textbox 3 Label lblnumber3 = new Label(); lblnumber3.parent = frmmain; lblnumber3.text = "Number 3"; lblnumber3.autosize = true; lblnumber3.left = 20; lblnumber3.top = txtnumber2.top + txtnumber2.height + 4; txtnumber3 = new TextBox(); txtnumber3.parent = frmmain; txtnumber3.left = 20; txtnumber3.top = lblnumber3.top + lblnumber3.height; //Button to calculate average Button btnaverage = new Button(); btnaverage.parent = frmmain; btnaverage.text = "Average"; btnaverage.left = 20;

9 9 btnaverage.top = txtnumber3.top + txtnumber3.height + 4; btnaverage.click += btnaverage_click; //Button to exit application Button btnexit = new Button(); btnexit.text = "&Close"; btnexit.left = frmmain.clientsize.width - btnexit.width; btnexit.top = frmmain.clientsize.height - btnexit.height; btnexit.click += btnexit_click; btnexit.parent = frmmain; //Run application and display form Application.Run(frmMain); } //End of Main //Event handler for the average button private static void btnaverage_click(object sender, EventArgs e) double dnumber1 = double.parse( txtnumber1.text); double dnumber2 = double.parse( txtnumber2.text); double dnumber3 = double.parse( txtnumber3.text); } double daverage = (dnumber1 + dnumber2 + dnumber3)/3; MessageBox.Show("Average: " + daverage.tostring("0.00")); //Event handler for Click event of btnexit private static void btnexit_click(object sender, EventArgs e) Application.Exit(); } //End of btnexit_click } //End of class Question 4 (12) using System; class Program static void Main() Console.Write("\n\tMiles: "); double dmiles = int.parse (Console.ReadLine() ); double dkms = dmiles * 1.61; Console.WriteLine("\tKilometres: " + dkms.tostring("0.00") ); } } Console.Write("\n\tPress any key to exit... "); Console.ReadKey();