Quiz 4 - Answers

1. How many elements are there in the following array?

   Dim x(1 To 10, 1 To 20) As Integer
   

   There are 200 elements.

2. Suppose we have an integer array x, declared as follows.

   Dim x(1 To 10, 1 To 20) As Integer
   

   Write Visual Basic statements to set each element in the array to 100.

   Dim i As Integer, j As Integer
   For i=1 to 10
      For j=1 to 20
         x(i,j) = 100
      Next j
   Next i
   
   

3. What does it mean to say that a computer is "universal"?

   Universality: Any problem solvable by some computer can be solvable by any computer

4. What is the output generated when the Form_Click event handler runs?

   Private Sub Form_Click()
     Call octopus(3,10)
   End Sub
   
   Private Sub octopus(a As Integer, b As Integer)
     Call jellyfish(a)
     Call jellyfish(b)
   End Sub
   
   Private Sub jellyfish(k As Integer)
     Print k+k
   End Sub
   

   The output is:

   6
   20
   

5. Write a procedure "cube" that takes two parameters, which are both integers. It should set the second parameter to the cube of the first parameter. For example, if you evaluate the following:

   Call cube(2,x)
   

   x will be set to 8. If you evaluate cube with a different argument:

   Call cube(5,x)
   

   then x will be set to 125. Include the proper header for the procedure.

   Here's the procedure:

   Private Sub cube(a As Integer, c As Integer)
     c = a*a*a
   End Sub