IST 256
Lab 6 โ February 4, 2008
1. Understanding Loops โ showing the variables of a program
For this problem, you are not to put any part of the program into Visual Studio. You are
to write your answers on this lab sheet. (This of this as a practice exam question.)
A. Consider the following program for a button:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim counter, sum As Integer
counter = 0
sum = 0
' add integers from 1 to 10
For counter = 1 To 10 Step 1
sum = sum + counter
Next counter
' show the number to the user
Label1.Text = CStr(sum)
End Sub
In the following boxes, write the values of the variables as this program is executed:
Variable
Val1
Val2
Val3
Val4
Val5
Val6
Val7
Val8
Val9
Val10
Val11
counter
sum
What number will be shown to the user? (write it here):
B. Consider the following program for a button:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim counter, sum, square As Integer
counter = 0
sum = 0
square = 0
' add the squares of integers from 1 to 6
For counter = 1 To 6 Step 1
square = counter * counter
sum = sum + square
Next counter
' show the number to the user
Label1.Text = CStr(sum)
End Sub
