S.2 Computer Literacy Question-Answer Book

Transcription

1 S.2 C.L. Half-yearly Examination ( ) S.2 C.L. Question- Answer Book Hong Kong Taoist Association Tang Hin Memorial Secondary School Half-yearly Examination S.2 Computer Literacy Question-Answer Book Date: 3 January 2012 Time: 8:30 a.m. 9:30 a.m. (1 hour) Instructions: 1. Full mark of this paper is This Question-Answer Book consists of 15 pages. 3. Attempt ALL questions. 4. Answer in complete sentences whenever applicable, or your effective communication marks will be deducted. Name Class Class Number Marks

2 S.2 C.L. Half-yearly Examination ( ) 2 Section A: Multiple Choice Questions (2M@, Total 30 marks) Put a in the box of the most suitable answer A B C D 1. Which of the following is a reserved keyword in Visual Basic? A. Visual B. Basic C. Project D. Class 2. Which of the following can be the name of a variable in Visual Basic? I. studentheight II. P&G III. 123Times A. I Only B. I, II Only C. II, III Only D. I, II and III 3. Which of the following is NOT a valid operator? A. + B. += C. Mod D Which of the following is NOT a property of a form? A. Left B. Number C. Text D. BackColor

3 S.2 C.L. Half-yearly Examination ( ) 3 5. Which of the following data types can be used to record the marks of a student in HKTA Tang Hin Memorial Secondary School? A. Integer B. Double C. Boolean D. Variable 6. Which of the following can be the value of a Boolean variable in Visual Basic? A. Yes B. No C. True D. Never 7. Which of the following statements contains an error? A. Label1.Text = Label2.Text + Label3.Text B. TextBox1.Left = 300 C. Me.Title = "234567" D. Button987.Enabled = False 8. The type of user interface with buttons, text boxes and labels is called A. GUI. B. CLI. C. prompt. D. SLI. 9. In Visual Basic, which operator is processed last? A. * B. ^ C. / D. \ 10. If you double click a button in the design view, the handler of which event is created? A. Click B. TextChanged C. DoubleClick D. Load

4 S.2 C.L. Half-yearly Examination ( ) Evaluate the VB expression Mod 12 \ 5 A. 1 B. 3 C. 4 D Which of the following statement will generate the dialog box below? A. MsgBox("Hello!" & vbcrlf & "I'm Stephanie.") B. MsgBox(Hello! & vbcrlf & I'm Stephanie.) C. MsgBox("Hello!" & vbcrlf & vbcrlf & "I'm Stephanie.") D. MsgBox(Hello! & vbcrlf & vbcrlf & I'm Stephanie.) 13. Study the following program, Public Class Form1 Private Sub Form1_Load(...) Handles MyBase.Load Dim x As Double = Val(InputBox("Enter x:")) Dim y As Double y = Math.Sqrt(x * x + 6) MsgBox(y) If the user enters 2.5 into the InputBox, what will be the output? A. 2.5 B. 3.5 C. 4.5 D. 5.5

5 S.2 C.L. Half-yearly Examination ( ) In the following program, the text box at the left is TextBox1, and the other is TextBox2. TextBox1 TextBox2 Public Class Form1 Private Sub Button1_Click(...) Handles Button1.Click Dim a As Integer Dim b As Integer a = TextBox1.Text b = TextBox2.Text b = a * 2 a = b + 3 Label1.Text = a + b When the user clicks Button1, the text in Label1 is changed to A. 6 B. 9 C. 12 D. 15

6 S.2 C.L. Half-yearly Examination ( ) Which of the code below will make the following change if we click Button1? TextBox1 TextBox2 A. Public Class Form1 Private Sub Button1_Click(...) Handles Me.Click TextBox2.AppendText(TextBox1.Text) B. Public Class Form1 Private Sub Button1_Click(...) Handles Me.Click TextBox2.Text = TextBox1.Text C. Public Class Form1 Private Sub Button1_Click(...) Handles Button1.Click TextBox2.AppendText(TextBox1.Text) D. Public Class Form1 Private Sub Button1_Click(...) Handles Button1.Click TextBox2.Text = TextBox1.Text

7 S.2 C.L. Half-yearly Examination ( ) 7 Section B: VB expressions (2M@, Total 10 marks) Convert the Mathematical expressions below to Visual Basic expressions. Mathematical Expression VB Expression e.g a = b + c a = b + c 1. v = u + at 2. A = 1 (a + b)h 2 3. m = y2 y1 x2 x1 (x1, x2, y1, y2 are names of variables.) 4. a = w 2 x 5. y = (a + b) 3 Section C: Coding (2M per line, Total 14 marks) Write the V.B. statement for the following operation for each case. Case Operation V.B. Statement(s) The text in Button1 changes to I m Button1.Text = "I'm clicked!" e.g. clicked! Title of the Form1 (as the current working form) becomes Hello!. The Button2 can be seen but cannot be clicked. The background colour of the Label3 becomes orange. 4. The TextBox4 cannot be seen. 5. The running programme stops running. 6. The Form5 appears while Form1 disappears. (Form1 is the startup and the current working form) (2 lines)

8 S.2 C.L. Half-yearly Examination ( ) 8 Section D: Programming (Total 15 marks) 1. Study the changes of this programme, fill in the blanks of the programme codes. [1M@, 5M] Step 1 When Form1 is loaded, the user is asked to enter his/her name, of which is represented by the variable inname. Step 2 As the user Jay enters his name, another interface like this appears. Line Programme code 1 Private Sub Form1_Load( ) Handles (1) 2 Dim inname As (2) 3 inname = (3) ("(4) ") 4 MsgBox("(5) ") 5

9 S.2 C.L. Half-yearly Examination ( ) 9 2. Study the changes of this programme, fill in the blanks of the programme codes. [1M@, 2M] Design View Step 1 Step 2 TextBox1 TextBox2 Button1 This is the design view of a form, with 4 labels, 2 textboxes and 1 button. All properties settings remain as the default values. Then, Form1 appears with the Button1 ( Check ) unable to be clicked. Button1 becomes clickable when the content in the TextBox2 is modified. Line Programme code 1 Private Sub TextBox2_TextChanged( ) Handles TextBox2.TextChanged 2 (1) = (2) 3

10 S.2 C.L. Half-yearly Examination ( ) Study the changes of this programme, fill in the blanks of the programme codes. 8M] Design view Step 1 Step 2 TextBox1 TextBox2 This is the design view of a form. The AutoSize property of Label3 is set as False. The user enters the class and class number into the two textboxes, e.g. 2E, 49. As Button1 is clicked, Label3 reveals the information as shown, and the values in TextBox1 and TextBox2 disappear. Step 3 Step 4 The user enters another set of values. Label3 reveals another set of responses.

11 S.2 C.L. Half-yearly Examination ( ) 11 Line Programme code 1 Private Sub Button1_Click( ) Handles Button1.Click 2 Dim inclass As (1) = TextBox1.Text 3 Dim innumber As Integer = (2) (TextBox2.Text) 4 Dim CheckDigit As (3) 5 Dim intext As String = (4) 6 CheckDigit = innumber (5) 7 Label3.Text = "(6) " & CheckDigit & "." & (7) & "If your Check Digit is 1, you are in odd number group." 8 TextBox1.Text = (8) 9 TextBox2.Text = intext 10

12 S.2 C.L. Half-yearly Examination ( ) 12 Section E: Debugging (Total 11 marks) Study this programme: Design view of the Form1 with Button1 as the Check out! button. Step 1 As the programme is loaded, user can enter the amount of fillet-o-fish and color s/he wants to buy. Step 2 As the user clicks the Check out! button, the amount to be paid is shown in another interface, with the Form1 changed like this. Background Colour : Red Step 3 As the user clicks the 確定 button, the Form1 disappears. Form1 disappear! Step 4 The last interface appears, and after clicking the 確 定 button on this interface, the programme stops.

13 S.2 C.L. Half-yearly Examination ( ) 13 Based on the flow shown above, the programme is as below, with 11 mistakes, and 1 mistake at each problem line. Line Programme code e.g. Private Sub Button1( ) Handles Button1 1 Dim numfillet Is Integer = Val(TextBox1.Text) 2 Let numcola be Integer = Val(TextBox2.Text) 3 Dim total As String 4 total = numfillet numcola Me.BackColor = ChangeTo.Red 6 Button1.Seen = False 7 MsgBox("Total: $" = total) 8 Me.Hidden() 9 MsgBox(Thank you for your purchase.) 10 Stop 11 Sub End Find out ALL of them and REWRITE the WHOLE programme line for each line. [1M@, 11M] Line Correct Version e.g. Private Sub Button1_Click( ) Handles Button1.Click

14 S.2 C.L. Half-yearly Examination ( ) 14 Section F: Comprehension (Total 20 marks) TextBox1 TextBox2 Button1 TextBox4 Figure 1 Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim sec, sec1, sec2 As String sec1 = TextBox1.Text sec2 = TextBox2.Text TextBox4.Text = sec1 + sec2 Figure 2 (a) Refer to the Figure 1 and Figure 2, what is the value in TextBox4 when the user enters 3600 into TextBox1 and 3800 into TextBox2 and then clicks Convert? (1 mark) (b) Refer to the Figure 1 and Figure 2, if the statement TextBox4.Text = sec1 + sec2 is changed to TextBox4.Text = Val(sec1) + Val(sec2), what is the value in TextBox4 if the user enters 3600 into TextBox1 and 3800 into TextBox2 and then clicks Convert? (1 mark) (c) Refer to the following program segment. h = i \ 3600 m = (i Mod 3600) \ 60 s = i Mod 3600 Mod 60 (i) What are the meanings of \ and Mod operators? (2 marks) (ii) Find the value of h, m and s if i = h is m is s is (6 marks)

15 S.2 C.L. Half-yearly Examination ( ) 15 (d) The program segment of part (c) is inserted into the program as shown below. Button1 TextBox1 TextBox2 TextBox3 TextBox4 Figure 3 Public Class Form1 Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim sec, sec1, sec2 As String Dim i, m, h, s As Integer sec1 = TextBox1.Text sec2 = TextBox2.Text sec = Val(sec1) + Val(sec2) i = Val(sec) h = i \ 3600 m = (i Mod 3600) \ 60 s = i Mod 3600 Mod 60 TextBox3.Text = h & "hours" & m & "minutes" & s & "seconds" TextBox4.Text = sec1 + sec2 Figure 4 (i) If the user enters into TextBox1 and 0.1 into TextBox2. I. What is the value of i. (1 mark) II. What are the values of TextBox3 and TextBox4 after the Convert button is clicked. (3 marks) (ii) If the user clicks the Convert button without any input, write down what you see in Form 1 on Figure 3. (3 marks) (iii) If the user now enters 0.1 into TextBox1 and into TextBox2 and then click Convert, will the values of TextBox3 and TextBox4 be the same as the result in part (d) (i)? If not, state their new values. (3 marks) * * * End of Paper * * *