Addition of Three Numbers in VB.NET

 Machine Problem

Write a program that will ask the user to gived three numbers, and compute the sum of that numbers.

Use the following formula below.

total_sum = (variable_one + variable_two +variable_three)

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Program Listing

' Addition of Three Numbers Using VB.NET

' Prof. Jake Rodriguez Pomperada, MAED-IT, MIT

' www.jakerpomperada.com  and www.jakerpomperada.blogspot.com

' jakerpomperada@gmail.com

' Bacolod City, Negros Occidental Philippines

' May 16, 2021   Sunday  11:23 AM

Public Class Form1

    ' Button Compute

    Private Sub btnCompute_Click(sender As Object, e As EventArgs) Handles btnCompute.Click

        Dim sum As Integer

        Dim a, b, c As String

        sum = 0

        a = txtValue1.Text

        b = txtValue2.Text

        c = txtValue3.Text

        If a = "" Or IsNumeric(a) = False Then

            MessageBox.Show("Please enter a numeric value.")

            txtValue1.Focus()

        ElseIf b = "" Or IsNumeric(b) = False Then

            MessageBox.Show("Please enter a numeric value.")

            txtValue2.Focus()

        ElseIf c = "" Or IsNumeric(c) = False Then

            MessageBox.Show("Please enter a numeric value.")

            txtValue3.Focus()

        Else

            sum = Val(a) + Val(b) + Val(c)

            MessageBox.Show("The sum of " & a & "," & b & ", and " & c & " is " & sum & ".", "The Result")

        End If

    End Sub

    'Button Quit

    Private Sub btnQuit_Click(sender As Object, e As EventArgs) Handles btnQuit.Click

        Dim result = MessageBox.Show(" Are you sure you want to quit the program?", "Confirmation", MessageBoxButtons.YesNo, MessageBoxIcon.Question)

        If result = DialogResult.Yes Then

            Me.Close()

        Else

            Me.Show()

            txtValue1.Text = ""

            txtValue2.Text = ""

            txtValue3.Text = ""

            txtValue1.Focus()

        End If

    End Sub

    

    'Button Clear

    Private Sub btnClear_Click(sender As Object, e As EventArgs) Handles btnClear.Click

        txtValue1.Text = ""

        txtValue2.Text = ""

        txtValue3.Text = ""

        txtValue1.Focus()

    End Sub

End Class