Member Avatar for pusangkinalbo12

make a simple calculator involving the following operations addition, subtraction, multiplication, division, square-root and percentage!!thanks....:)

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  • Latest Post Latest Post by Jx_Man

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Building on 's request and the quick UI tip from (two inputs + a result) while keeping 's point about math functions in mind: here is a compact, practical pattern for a VB.NET Windows Forms calculator that implements addition, subtraction, multiplication, division, square root and percentage, with input validation and edge-case handling.

Use two TextBoxes (txtA, txtB), a Label (lblResult) and operator Buttons (btnAdd, btnSub, btnMul, btnDiv, btnSqrt, btnPercent). Percent behavior implemented below: when both inputs exist it computes A% of B ((A/100)*B); when only A is present it returns A/100. Always validate with Double.TryParse and check divide-by-zero and negative input for square root; see Double.TryParse and Math.Sqrt for details.

Private Function TryGetValues(ByRef a As Double, ByRef b As Double) As Boolean
    If Not Double.TryParse(txtA.Text, a) Then
        MessageBox.Show("Enter a valid number for A")
        Return False
    End If
    Double.TryParse(txtB.Text, b) ' b optional
    Return True
End Function

Private Sub btnDiv_Click(sender As Object, e As EventArgs) Handles btnDiv.Click
    Dim a,b As Double
    If Not TryGetValues(a,b) Then Return
    If b = 0 Then
        lblResult.Text = "Cannot divide by zero"
        Return
    End If
    lblResult.Text = (a / b).ToString()
End Sub

Private Sub btnSqrt_Click(sender As Object, e As EventArgs) Handles btnSqrt.Click
    Dim a As Double
    If Not Double.TryParse(txtA.Text, a) Then Return
    If a < 0 Then lblResult.Text = "Invalid input (negative)" : Return
    lblResult.Text = Math.Sqrt(a).ToString()
End Sub

Private Sub btnPercent_Click(sender As Object, e As EventArgs) Handles btnPercent.Click
    Dim a,b As Double
    If Not TryGetValues(a,b) Then Return
    If txtB.Text.Trim() = "" Then lblResult.Text = (a / 100).ToString() Else lblResult.Text = ((a / 100) * b).ToString()
End Sub

Quick tips: format results with Math.Round for display, handle culture-specific decimals if needed, and prefer Double (or Decimal for financial accuracy). This pattern keeps the UI simple as suggested but adds the validations and behaviors students will commonly expect.

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Member Avatar for jack008

Calculator is helpul every student life.It is using all the mathematical functions.
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jack008

Member Avatar for Jx_Man

just draw two Textbox as input and one Label as result and a Button to process it.

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