LOOPING

What is wrong with the following Do loop?   Dim index As Integer = 1
Do While index <> 9  
MsgBox("Hello")
index =index+1   
Loop

• (a)The test variable should not be changed inside a Do loop. 
• (b) The test condition will never be true. 
• (c) This is an infinite loop. 
• (d) Nothing 

Private Sub disp ()
Dim num as Double = 10  
Do While num > 1
MsgBox(num)
 num = num - 3
Loop
End Sub. 
 What numbers will be displayed in the list box when the button is clicked? 

• (a) 10, 7, and 4 
• (b)  10, 7, 4, and 1 
• (c)10, 7, 4, 1, and -2 
• (d) no output

Which While statement is equivalent to Until num < 100? 

• (A)  While num <= 100 
• (B) While num > 100 
• (c) While num >= 100 
• (d) (A)  There is no equivalent While statement. 

What is wrong with the following Do loop?   Dim index As Integer = 1
 Do While index <> 10  
MsgBox("Hello")
index =index+ 2  
Loop

• (A)  It should have been written as a Do Until loop. 
• (B) It is an infinite loop. 
• (C)  The test variable should not be changed within the loop itself. 
• (D) Nothing

In analyzing the solution to a program, you conclude that you want to construct a loop so that the loop terminates either when (a < 12) or when (b = 16). Using a Do loop, the test condition should be 

• (A)  Do While (a > 12) Or (b <> 16) 
• (B)  Do While (a >= 12) Or (b <> 16) 
• (c)  Do While (a < 12) Or (b <> 16) 
• (D) (A)  Do While (a >= 12) And (b <> 16) 

When Visual Basic executes a Do While loop it first checks the truth value of the _________. 

• (A)  pass 
• (B)  loop 
• (C) condition 
• (D) statement

If the loop is to be executed at least once, the condition should be checked at the __________. 

• (A)  top of the loop 
• (B)  middle of the loop 
• (C)  bottom of the loop 
• (D) Nothing should be checked. 

How many times will HI be displayed when the following lines are executed?  
Dim c As Integer = 12
Do  
MsgBox("HI")
c =c+ 3  
Loop Until (c >= 30)

• (A) 5 
• (B) 9 
• (C) 6 
• (D) 10

What numbers will be displayed in the list box by the following code when the button is clicked?  
Private Sub Display_()  
 Dim num As Integer = 7  
Do  
 num += 1
MsgBox(num)  
Loop Until (num > 6)
MsgBox(num)  
 End Sub

• (A) 7 
• (B) 7 & 8 
• (C) 7 & 7
• (D) 8 & 8

 __________ calculate the number of elements in lists. 

• (A)  Sentinels 
• (B)  Counter variables 
• (C)  Accumulators 
• (D) Nested loops