A simple program to compute the are of the circle using functions in Microsoft Visual Basic NET.
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Program Listing
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
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