Final Examination Semester 2 / Year 2010

Transcription

1 Southern College Kolej Selatan 南方学院 Final Examination Semester 2 / Year 2010 COURSE : VISUAL BASIC.NET COURSE CODE : PROG2024 TIME : 2 1/2 HOURS DEPARTMENT : COMPUTER SCIENCE LECTURER : LIM PEI GEOK Student s ID : Batch No. : Notes to candidates: 1) The question paper consists of 6 pages Section A: 10 questions (20 marks) Section B: 2 questions (20 marks) Section C: 2 questions (60 marks) 2) Answer all questions. 3) Write your answer for Section A and Section B in answer booklet. 4) Save your answer for question in Section C and submit your answer in softcopy to Southern College E-Learning System.

2 SECTION A: MULTIPLE CHOICE QUESTION ( 10 X 2 = 20 MARKS ) Please choose most appropriate answer. State the answer in the answer booklet. 1. You use the method to add items to a list box. a. AddList b. Item c. AddItems d. Add 2. Which of the following will return by InputBox function if user clicks the Cancel button or Close button on title bar? a. An empty String b. A number zero c. An error message d. None of above 3. Dim count As Integer = 1 Do MessageBox.Show( Hello ) count = count + 1 Loop While count > 5 How many times will the MessageBox.Show method in the code above be processed? a. 1 b. 2 c. 3 d Which of the following calculates the monthly payment on a loan of $1000 for three years at 5% interest? Payment should be expressed as a positive number. a. -Financial.Pmt(1000, 0.05, 3) b. -Financial.Pmt(0.05/12, 36, 1000) c. -Financial.Pmt(0.05, 3, 1000) d. -Financial.Pmt(0.05, 3*12, 1000) 5. Dim fullname As String = John Bearly Which of the following change the fullname to John Pearly? a. fullname = fullname.change( B, P ) b. Mid(fullName, 5) = P c. fullname = fullname.replace( B, P ) d. Both b and c 6. Which event will be trigger when a change is made to the contents of a control s Text property? a. Enter b. SelectAll c. Click d. TextChanged 1/6

3 7. Which of the following is FALSE about procedure? a. There are two type of procedure which are sub procedure and function procedure. b. Sub procedure return a value after performing its task, whereas, function procedure does not return a value. c. You can pass information to both sub and function procedure either by value or by reference. d. When calling a procedure, the number of arguments listed in the argumentlist should agree with the number of parameters listed in the parameterlist in the procedure header. 8. Dim num() as Integer ={1, 2, 3, 4, 5} Which of the following value stored in the num(3). a. 2 b. 3 c. 4 d Which of the following statements sort the sales array in descending order? a. Sort(sales) b. sales.reverse() c. Array.Sort(sales) d. Array.Reverse(sales) 10. If the elements in two or more array are related by their subscripts, the arrays are called as arrays. a. parallel b. coupled c. matching d. associated 2/6

4 SECTION B: SHORT QUESTIONS ( 20 MARKS ) Question 1 (10 Marks) a) Write a Structure statement that defines a structure named Book. The structure contains two String member variables named title and author and a Decimal member variable named cost. (5 Marks) b) Write a Private statement that declares a Book variable named fiction. (1 Mark) c) Write an assignment statement that assigns the string Microsoft Visual Basic 2008 Reloaded to title member variable. (1 Mark) d) Write an assignment statement that assigns the string Diane Zak to author member variable. (1 Mark) e) Write an assignment statement that assigns the decimal number RM to cost member variable. (1 Mark) f) Display the cost member variable in salestextbox. The cost should be displayed with a dollar sign and two decimal places. (1 Mark) Question 2 (10 Marks) Consider the following Visual Basic code. Answer the following question based on the code below. Dim state() As String = { Texas, Alaska, NewYork, United America } Dim phonenum() As String = { , , } phonenum(1) = phonenum(1).replace( 800, 877 ) (a) Mid(state(3), 8) = Kindom displaylabel.text = state(3) (b) a) What is the latest value for phonenum(1) after we execute statement (a) (2 Marks) b) Write the Visual Basic code that uses the Like operator to determine whether any elements in the state array contains a string begin with letter N then end with letter k. If found, then display that element in statuslabel, otherwise, display Not Found (5 Marks) c) What is the output of state(3) in statement (b)? (2 Marks) d) Write the Visual Basic code to show the string length for state(3). (1 Marks) 3/6

5 SECTION C: CODING QUESTIONS (60 MARKS) Question 1 (30 MARKS) You need to create an application that allow user to enter an integer number. The application will display a multiplication table that show a result of multiplying the user entered number by numbers 1 through 9. If the number entered by user is not an integer number then you need to show an error message in the label (as shown in figure 3). It is better to code this application using functions or sub procedure. You need to work on the application as follows: a) Create the user interface as show in figure 1. Set 0 as default value for the text box while first load the application. (8 marks) b) Write the function for showing the multiplication table when user types an integer number in the text box. In figure 2, it will show the multiplication result in label while user enters number 4. (12 marks) c) Write the function for validate the number entered by the user. If user enters an input which is not an integer number, then the application should show an error message in the label as show in figure 3. (8 marks) d) Write the function for exit button. (2 marks) Figure 1: User interface for Multiplication Application. Figure 2: While user enters number 4 in the textbox, it will show the multiplication result in the label. 4/6

6 Figure 3: While user enters a letter q, it will show an error message in the label. Question 2 (30 MARKS) You need to create an application named as Serial Number Generator that generates and display 4 unique codes as show in figure 4 below. For each code, it should contain one character (A to Z) and follow by 3 digit number (000 to 999). These codes should be generate randomly and unique to each other. Figure 5 show the user interface for this application. Figure 6 show the example output for this application. A123-B456-C789-E082 Code 1 Code 2 Code 3 Code 4 Figure 4: 4 codes which each code will contain one character and 3 digits. Your tasks are as follows: a) Create user interface as show in figure 5. (5 marks) b) Write the function for exit button. (2 marks) c) Write the function for Generator button. You are require to use array for this question. (23 marks) Hint: You can use a four element array for store these 4 codes and then display the codes in the label. For each code, you will randomly generate one character then follow by three digit integers. In case of randomly generate one character from A to Z, you can declare an array that contain the letter A to Z. After that, you can use Random method to generate an integer number which will be use to represent the index of the array elements. In case of generate a unique code, you can generate a code and then compare it with the generated elements of array (which is the array that storing these four codes). You need to generate the code again until no duplicated code exists. You are recommended to use function or sub procedure for this question. 5/6

7 Figure 5: User Interface Figure 6: Example output 000 6/6