Hi, I have been assigned (for a class) to make a calculator. It has to have add, subtr, multiply, divide and Square root. I have gotten all of these to work but when I try to use my square root button I get an error because i am only using one of the two input boxes.

I am at a loss. The design of my calculator has two text boxes for number input, a combo box for operations and a label box for the answer. I will give the script and keep my fingers crossed that one of you knows what is going wrong.


Private Sub cmdEqual_Click()

Dim Box1 As Single
Box1 = txtDisplay.Text

Dim Box2 As Single
Box2 = txtDisplay2.Text

Dim sngComputes As Single

Select Case cboFunctions.Text

Case "Add"
sngComputes = Box1 + Box2

Case "Subtract"
sngComputes = Box1 - Box2

Case "Multiply"
sngComputes = Box1 * Box2

Case "Divide"
sngComputes = Box1 / Box2

Case "SquareRoot"
sngComputes = (txtDisplay.Text ^ (1 / 2))

If Box1 < 1 Then
MsgBox "Cannot have a negative number"
End If

End Select

Dim Solution As Single
Solution = sngComputes

lblAnswer.Caption = Solution

End Sub

The error could be that you are not assinging any information to box2. You might want to place an if statement so that if box2 is not used it knows that you are going to be performing a square root.

this should work, basically only sets up Box2 if it has something in the text box