simple program to compute the are of the circle using functions in Microsoft Visual Basic NET.
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Public Class Form1 Dim area As Double Function Solve_Area(ByVal radius As Double) As Double radius = Single.Parse(Val(TextBox1.Text)) area = Math.Round(3.14F * radius * radius, 2) Return area End Function Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click TextBox2.Text = Solve_Area(Val(TextBox1.Text)) End Sub Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click End End Sub Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click TextBox1.Text = "" TextBox2.Text = "" TextBox1.Focus() End Sub End Class