Calculator cannot compute more than 2 number Eg: 2+3+4..

Question

1.00/5 (1 vote)

See more:

Help pls~
i m currently making a simple calculator with 1 text box, +-*/, AC +/- and =....
but i can only work with 2 numbers.. it cant compute more than 2 numbers.. Eg: 2+2+3..
Here some of my coding..

VB

Dim x As String
Dim num1 As Double
Dim num2 As Double

Private Sub cmd8_Click()
    txtDisplay.Text = txtDisplay.Text & "8"
End Sub

Private Sub cmdAdd_Click()
    num1 = txtDisplay.Text
    txtDisplay.Text = ""
    x = "+"
End Sub ' <----- this was missing

Private Sub cmdEqual_Click()
    num2 = txtDisplay.Text
    If x = "+" Then
        txtDisplay.Text = num1 + num2
    ElseIf x = "-" Then
        txtDisplay.Text = num1 - num2
    ElseIf x = "*" Then
        txtDisplay.Text = num1 * num2
    ElseIf x = "/" Then
        If num2 = "0" Then
            txtDisplay.Text = num1 / num2
        End If
    End If   ' <--------- this was missing
End Sub

Posted 6-May-11 2:30am

Kent1010

Updated 6-May-11 2:42am

#realJSOP

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

#realJSOP · Answer 1 · 2011-05-06T02:43:00

See my corrections to your code. Try using the debugger, and see what you come up with. The debugger is a free tool that's installed with Visual Studio.

BTW, it should go something like this:

VB

Private Sub cmdEqual_Click()
    num2 = txtDisplay.Text
    If x = "+" Then
        num1 += num2
    ElseIf x = "-" Then
        num1 -= num2
    ElseIf x = "*" Then
        num1 *= num2
    ElseIf x = "/" Then
        num1 /= Math.Max(1, num2)
    End If   ' <--------- this was missing
    txtDisplay.Text = Convert.ToString(num1)
End Sub