IST 256
Lab Week 14 – November 24, 2008
(only one part this week)
1. Understanding a Two-dimensional Array Program
Suppose that we have a two-dimensional array that was read in from the file
“samples.txt”, as shown in class. Shown here is the declaration of the array and how it
would look:
Dim numbers(0 To 5, 0 To 2) As Integer
numbers Column 0 Column 1 Column 2
Row 0 15 3 -7
Row 1 25 6 99
Row 2 35 -20 17
Row 3 45 10 3
Row 4 55 22 4
Row 5 65 -9 11
a. Write an expression that will give the array element in Row 2, Column 1:
What is the value of this element?
b. Here is a code fragment that shows a nested loop that iterates over every element of
the array.
Dim total as Integer
Label1.Text = “ “
For row = 0 to 5
total = 0
For col = 0 to 2
total = total + numbers(row,col)
Next
Label1.Text = Label1.Text & “Sum over “ & row &”= “ & total & vbCrLf
Next
Given the values in the numbers array, what will the value of Label1.Text be during the
first iteration of the outermost loop, when row = 0?
What are the remaining values given in the Label?
