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This is a Sample calculator that I created in visual basic 2008, and this sample will be more useful for learners who are interested in VB 2008 and fortunately the VS 2019 can upgrade the source code perfectly. You can study it and modify it as more as you like.
First, create an Interface for your calculator which has the following:
After that, set the variables for the operator, value 1, value 2, and other needed for operations.
Option Explicit On Public Class Form1 Dim Operand1 As Double Dim Operand2 As Double Dim [Operator] As String Dim hasDecimal As Boolean Dim tmpValue As Double End Class
Then, for each number buttons. For script below, my textfield named as "txtInput" and "cmd1" for my number 1 button.
Private Sub cmd1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmd1.Click txtInput.Text = txtInput.Text & sender.text End Sub
For the operation buttons except for the square root button, follow the script below and change the "[Operator]" value according to the operator you have set to the button.
Private Sub cmdAdd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdAdd.Click Operand1 = Val(txtInput.Text) txtInput.Text = "" txtInput.Focus() [Operator] = "+" End Sub
And for the equal/result button. Use the following code below.
Private Sub Button23_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button23.Click Dim Result As Double Operand2 = Val(txtInput.Text) Select Case [Operator] Case "+" Result = Operand1 + Operand2 txtInput.Text = Result.ToString() Case "-" Result = Operand1 - Operand2 txtInput.Text = Result.ToString() Case "/" Result = Operand1 / Operand2 txtInput.Text = Result.ToString() Case "*" Result = Operand1 * Operand2 txtInput.Text = Result.ToString() Case "^" Result = Operand1 ^ Operand2 txtInput.Text = Result.ToString() Case "%" Result = Operand1 * 1 / 100 txtInput.Text = Result.ToString() End Select txtInput.Text = Result.ToString() End Sub
Next is we will create the function that calculates the square root of the value when the square root button will be clicked.
Private Sub cmdSqrtRoot_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSqrtRoot.Click 'Make sure the input box has a value If txtInput.Text.Length <> 0 Then 'Assign our variable the value in the input box tmpValue = CType(txtInput.Text, Double) 'Perform the square root tmpValue = System.Math.Sqrt(tmpValue) 'Display the results in the input box txtInput.Text = CType(tmpValue, String) 'Clear the decimal flag hasDecimal = False End If End Sub
And lastly, creating a function for the button clear, backspace, and decimal.
'for the Decimal Private Sub cmdDecimal_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdDecimal.Click If InStr(txtInput.Text, ".") > 0 Then Exit Sub Else txtInput.Text = txtInput.Text & "." End If End Sub 'Clear Function Private Sub CmdClearAll_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CmdClearAll.Click txtInput.Text = "" End Sub 'Off Function Private Sub cmdOFF_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CmdOff.Click txtInput.Text = "" End Sub
That's it, you can now try to debug your simple calculator and test if the Source Code works perfectly as planned. In case it doesn't work the way it should be, you download the working source code below.
Happy Coding : )
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