POLYTECHNIC OF NAMIBIA SCHOOL OF COMPUTING AND INFORMATICS DEPARTMENT OF COMPUTER SCIENCE
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1 /. POLYTECHNIC OF NAMIBIA SCHOOL OF COMPUTING AND INFORMATICS DEPARTMENT OF COMPUTER SCIENCE COUR ENAME: PROGRAMMING 1 COUR ECODE: PRGSlOS NQFLEVEL: 5 DATE: JUNE DURATION: 2HOURS MARKS: 100 PAPER: THEORY 1st OPPORTUNITY EXAMINATION QUESTION PAPER EXAMINER: MODERATOR: MRJOELEELU MR COLIN STANLEY INSTRUCTIONS 1. Write all your answers in the answer booklet provided. 2. Thi paper consists of three sections; ection A, B, C and D. 3. Answer ALL questions in section A, B, C and D..t. Begin each section on a new page. 5. Marks/scores per question are given in [ ]. 6. Do not use or bring into the examination venue books, programmable calculators, mobile devices and other material that may provide you with unfair advantage. bould you be in posse ion of one right now, draw the attention of the examination officer or in igilator. This paper coosi ts of 7 pages including this cover
2 SECTION A Indicate your answer by writing True or False. [10 Marks] 1. Multiple inheritance is different from multiple levels of inheritance. 2. A class D can be derived from a class C, which is derived from a class B, which is derived from a class A. 3. Creating empty structures is allowed in C#.NET. 4. The/* and*/ symbols can only be used for multi-line comments. 5. Logical expressions always evaluate to a Boolean value. 6. Any for loop can be interchanged with a while loop. 7. An if statement can be nested in the else clause of another if statement 8. All case-structures can be converted to equivalent il:then-else structures. 9. All while loops repeat the associated body more than once. I 0. All functions must be called from the main function for them to be executed. PRG51 OS June 2015 Examination Page 2 of7
3 SECTION B Question 11 Give at least four advantages of using functions when writing programs. [20 Marks] [ 4 marks] Question 12 List atleast two (2) examples of an Interpreter and a Compiler. [4 marks] Question 13 What is inheritance? [3 marks] Question 14 How does exception handling work? Give an example. [4 marks] Question 15 [ 5 marks ] What is branching and what arc the three types of branching? PRCi51 OS June 2015 Fxamination Page 3 of7
4 @ セM セM SECTION C [15 Marks] Complete the tables below. Question 16 (4 marks] The truth table shows the return value of the operations between two or more Boolean values using the logical operators Example Operation Return Value True II True True II False True && True True && False Question 17 C# relational operators are listed below Operator Meaning --!= >=... Less than Less than or equal to - Greater than - [6 marks] Question 18 Logical expressions Expression 5 =4115==5 -- Return Value [5 marks] 5==4 && 5 == 5!(5 < 4) + '(4 < 5) 11 5<=4 3 > 2 && 3 < 5 I - - I-- June 2015 Examination Page -1 of 7
5 SECTIOND [50 Ylarks] Question 19 [8 marks] Write the appropriate code using a switch statement to accommodate the following information given to you. Switch Statement Assume you would want to check the year of study of a student If year of study is 1 then the student is in year 1 If year of study is 2 then the student is in year 2 If year of study is 3 then the student is in year 3 Question 20 [9 marks] List with examples, the three forms of iteration and write an example or sample code for each. Question 21 Explain what the following program code is doing. [8 marks] static void Main(string[] args) Console.Write("Enter name of currency to convert: "); string currency Name= Console.ReadLine(); Console.Write("Enter amount to convert to Namibian dollars:"); string amountstring = Comole.ReadLine(); double amount = double.parse( amountstring); Console. Write("Enter the rate to Namibian dollars :"); string rate String = Console.ReadLine(); double rate= doublc.parse(ratcstring); CurrencyConverter(rate, amount); static void CurrencyConverter(doublc rate, double amount) double result; result= rate * amount; Console. \VriteLine("Converted Amount=" + result); Question 22 Analyse the code below and fill in the blanks as numbered: //(l) //(2) //("',) //(-\) --- //(5) M [10 marks] using System; PRG510S June 2015 Examination Page 5 of7
6 using System. Collections. Generic; using System.Linq; using System. Text; namespace student_ ages class Program static void Main( string[] args) //(!) --= c: int (] stud_ Ages= new int[20]; string [] stud_ Names= new string [20]; int count=o, int stud_total_age = 0; double stud_ Average_ Age; //getting the student details and calculating students average age do I 1(2) MZM セ LNM MZM ]MZMLNLNLMZMLM ᆳ Console.WriteLine("Student age 0: ",count+!); stud_ Ages[ count] = int.parse(console.readline()); //prompting the user for the student name Console.WriteLine("Student's name 0: ",count+!); stud_names[count] = Console.ReadLine(); Console. WriteLine("\n"); //(3) -..., ,----,..----,--- stud_total_age = stud_total_age + stud_ages(count]; count++; //calculating the average student age of20 students stud_average_age = stud_total_age I 20; while( count<20); //(4)---., Console. WriteLine("students Average age: O:n2 ",stud_ Average_ Age); Console. WriteLincC'* * * * * * * * * ** * * * * * * * * * * * * * * * * ** * * * * * * * * * * * * * * *** * JG セ I[@ for (inti= 0; i < 20; i++) //(5) if( stud_ Ages [ i ]>stud_ Average_ Age) Console. WriteLine("Student name: "+stud Names[i]); PRG510S June 2015 Examimtion Page 6 of7
7 ) Console.ReadKey(); Question 23 [10 marks] Write a program that computes the average ofx numbers where xis initially unknown. Question 24 Write a program that computes the area of a triangle. (A=(height*base)/2] [10 marks] ****End of Examination**** PRG510S June 2015 Examination Page 7 of7
POLYTECHNIC OF NAMIBIA SCHOOL OF COMPUTING AND INFORMATICS DEPARTMENT OF COMPUTER SCIENCE
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