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This chapter is from the book

Self-Review Exercises

4.1

Answer each of the following questions.

  1. ________ refer(s) to the task of ordering an application's statements correctly.
    1. Actions
    2. Program control
    3. Control structures
    4. Visual programming
  2. A(n) ________ is a plan for solving a problem in terms of the actions to be executed and the order in which these actions are to be executed.
    1. chart
    2. control structure
    3. algorithm
    4. ordered list
  3. ________ is an informal language that helps you develop algorithms.
    1. Pseudocode
    2. VB-Speak
    3. Notation
    4. None of the above
  4. Pseudocode ________.
    1. usually describes only declarations
    2. is executed on computers
    3. usually describes only executable lines of code
    4. usually describes declarations and executable lines of code
  5. All Visual Basic applications can be written in terms of ________ types of control structures.
    1. one
    2. two
    3. three
    4. four
  6. The process of application statements executing one after another in the order in which they are written is called ________.
    1. transfer of control
    2. sequential execution
    3. workflow
    4. None of the above
  7. Which of the following If...Then statements correctly displays that a student received an A on an exam if the score was 90 or above?

    1. If studentGrade <> 90 Then displayLabel.Text = "Student received an A"
      End If
                        
    2. If studentGrade > 90 Then
         displayLabel.Text = "Student received an A"
      End If
                        
    3. If studentGrade = 90 Then
         displayLabel.Text = "Student received an A"
      End If
                        
    4. If studentGrade >= 90 Then
         displayLabel.Text = "Student received an A"
      End If
                        
  8. The symbol ________ is not a Visual Basic operator.
    1. *
    2. ^
    3. %
    4. <>
  9. If...Then...Else is a ________ -selection statement.
    1. single
    2. double
    3. triple
    4. nested
  10. Placing an If...Then...Else statement inside another If...Then...Else statement is an example of ________.
    1. nesting If...Then...Else statements
    2. stacking If...Then...Else statements
    3. creating sequential If...Then...Else statements
    4. None of the above
  11. The *= operator ________.
    1. squares the value of the right operand and stores the result in the left operand
    2. adds the value of the right operand to the value of the left operand and stores the result in the left operand
    3. creates a new variable and assigns the value of the right operand to that variable
    4. multiplies the value of the left operand by the value of the right operand and stores the result in the left operand
  12. If number is initialized with the value 5, what value will number contain after the expression number -= 3 executes?
    1. 3
    2. 5
    3. 7
    4. 2
  13. Method String.Format is used to ________.
    1. create constants
    2. control how text is formatted
    3. format Visual Basic statements
    4. All of the above
  14. An application enters break mode when ________.
    1. Debug > Start is selected
    2. a breakpoint is reached
    3. there is a syntax error
    4. None of the above.
  15. The body of a Do While...Loop statement executes ________.
    1. at least once
    2. never
    3. while its condition is true
    4. while its condition is false
  16. The UML represents both the merge symbol and the decision symbol as ________.
    1. rectangles with rounded sides
    2. diamonds
    3. small black circles
    4. ovals
  17. A Do Until...Loop repetition statement differs from a Do While...Loop repetition statement in ________.
    1. that a Do While...Loop repetition statement loops as long as the loop-continuation condition remains False, whereas a Do Until...Loop repetition statement loops as long as the loop-continuation condition remains True
    2. that a Do Until...Loop repetition statement loops as long as the loop-termination condition remains False, whereas a Do While...Loop repetition statement loops as long as the loop-continuation condition remains True
    3. that a Do Until...Loop repetition statement always executes at least once
    4. no way. There is no difference between the Do Until...Loop and Do While...Loop repetition statements
  18. Statements in the body of a Do Until...Loop execute repeatedly for as long as the ________ remains False.
    1. loop-continuation condition
    2. do-loop condition
    3. loop-termination condition
    4. until-loop condition
  19. Counter-controlled repetition is also called because the number of repetitions is known before the loop begins executing.
    1. definite repetition
    2. known repetition
    3. sequential repetition
    4. counter repetition
4.2

State whether each of the following is true or false. If false, explain why.

  1. It's difficult to convert pseudocode into a Visual Basic program.
  2. Sequential execution refers to statements in a program that execute one after another.
  3. The If...Then statement is called a single-selection statement.
  4. Pseudocode closely resembles actual Visual Basic code.
  5. The Do While statement is terminated with the keywords End While.
4.3

Write two different Visual Basic statements that each add 1 to Integer variable number.

4.4

Write a statement or a set of statements to accomplish each of the following:

  1. Sum the odd integers between 1 and 15 using a While statement. Use Integer variables sum and count.
  2. Sum the squares of the even integers between 1 and 15 using a Do While...Loop repetition statement. Use Integer variables sum and count and initialize them to 0 and 2, respectively.
  3. Display the numbers from 5 to 1 in resultListBox using a Do Until...Loop and Integer counter variable counterIndex. Initialize counterIndex to 5.
  4. Repeat Exercise 4.4 (c) using a Do While...Loop statement.
4.5

Write a Visual Basic statement to accomplish each of the following tasks:

  1. Declare variables sum and number to be of type Integer.
  2. Assign 1 to variable number.
  3. Assign 0 to variable sum.
  4. Total variables number and sum, and assign the result to variable sum.
  5. Display "The sum is: " followed by the value of variable sum in resultLabel.
4.6

Combine the statements that you wrote in Exercise 4.5 into a program that calculates and displays the sum of the Integers from 1 to 10. Use a Do While...Loop statement to loop through the calculation and increment statements. The loop should terminate when the value of control variable number becomes 11.

4.7

Identify and correct the error(s) in each of the following (you may need to add code):

  1. The following loop should total the values from 1 to 50. Assume that value is 50.
    Do While value >= 0
       sum += value
    Loop
                
  2. The following code should display the squares of 1 to 10 in resultListBox.
    Dim number As Integer = 1
    Do While number < 10
       resultListBox.Items.Add(number ^ 2)
    End While
                
  3. This segment should display the integers from 888 to 1000 in resultListBox. Initialize variable value to 888.
    Dim value As Integer = 888
    
    Do While value <= 1000
       value -= 1
    Loop
                
4.8

State whether each of the following is true or false. If the answer is false, explain why.

  1. Pseudocode is a structured programming language.
  2. The body of a Do While...Loop is executed only if the loop-continuation test is false.
  3. The body of a While...End While is executed only if the loop-continuation test is false.
  4. The body of a Do Until...Loop is executed only if the loop-termination condition is false.
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