Sum of Digits in Visual Basic.NET

 Write a Visual Basic.NET program to ask the user to give a series of number and then the

program will calculate the sum of the digits of a given number.

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Program Listing

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim n, sum, r As Integer

        Dim display As String

        n = CInt(TextBox1.Text)

        sum = 0

        While n <> 0

            r = n Mod 10

            sum += r

            n \= 10

        End While

        display = sum.ToString()

        TextBox2.Text = display

    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click

        TextBox1.Text = ""

        TextBox2.Text = ""

        TextBox1.Focus()

    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click

        End

    End Sub

End Class