VB Calculator: A Simple Calculator Program

This project demonstrates how to build a basic calculator application using Visual Basic (VB.NET). The program features a graphical user interface (GUI) for performing arithmetic operations like addition, subtraction, multiplication, and division.

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🚀 Key Features

• User-Friendly Interface:

  • Intuitive design for entering numbers and selecting operations.

• Core Arithmetic Operations:

  • Supports addition, subtraction, multiplication, and division.

• Error Handling:

  • Handles invalid inputs and division by zero gracefully.

• Extensible Design:

  • Modular code structure allows for easy addition of advanced features.

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🛠 Code Example

Visual Basic Code

Public Class Calculator

    Private firstNumber As Double
    Private secondNumber As Double
    Private operation As String

    ' Handle number button clicks
    Private Sub Button_Click(sender As Object, e As EventArgs) Handles btn0.Click, btn1.Click, btn2.Click, btn3.Click, btn4.Click, btn5.Click, btn6.Click, btn7.Click, btn8.Click, btn9.Click
        txtDisplay.Text &= CType(sender, Button).Text
    End Sub

    ' Handle operator button clicks
    Private Sub Operator_Click(sender As Object, e As EventArgs) Handles btnAdd.Click, btnSubtract.Click, btnMultiply.Click, btnDivide.Click
        firstNumber = Double.Parse(txtDisplay.Text)
        operation = CType(sender, Button).Text
        txtDisplay.Clear()
    End Sub

    ' Perform calculation
    Private Sub btnEquals_Click(sender As Object, e As EventArgs) Handles btnEquals.Click
        Try
            secondNumber = Double.Parse(txtDisplay.Text)
            Select Case operation
                Case "+"
                    txtDisplay.Text = (firstNumber + secondNumber).ToString()
                Case "-"
                    txtDisplay.Text = (firstNumber - secondNumber).ToString()
                Case "*"
                    txtDisplay.Text = (firstNumber * secondNumber).ToString()
                Case "/"
                    If secondNumber <> 0 Then
                        txtDisplay.Text = (firstNumber / secondNumber).ToString()
                    Else
                        txtDisplay.Text = "Error: Division by zero"
                    End If
            End Select
        Catch ex As Exception
            txtDisplay.Text = "Error: Invalid input"
        End Try
    End Sub

    ' Clear the display
    Private Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click
        txtDisplay.Clear()
        firstNumber = 0
        secondNumber = 0
    End Sub

End Class

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🌍 Use Cases

• Basic Arithmetic:

  • Perform quick calculations directly within the application.

• Learning Project:

  • An excellent starting point for beginners learning VB.NET and GUI programming.

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🛠 Future Enhancements

• Advanced Mathematical Functions:

  • Add support for square roots, exponents, and trigonometric functions.

• Memory Features:

  • Include buttons for memory recall (MR), memory clear (MC), and memory add (M+).

• Keyboard Support:

  • Allow users to enter numbers and operations using the keyboard.

• Theme Customization:

  • Add light and dark mode options for the interface.

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🎯 Benefits

• Simple and Interactive: Provides a hands-on way to learn VB.NET programming.
• Modular Design: Code can be expanded to include more features easily.
• Practical Utility: A useful tool for basic calculations.

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🌟 Conclusion

This VB.NET calculator program is a straightforward project that introduces core concepts of GUI development and event handling. Its simplicity makes it ideal for beginners, while its modular design ensures scalability for more advanced features.

💡 Start building and enhancing your VB.NET calculator today!