Area of the Rectangle in VB.NET

 Machine Problem

Write a program that will ask the user to give a radius of a circle and the program will compute

the area of the circle.

Use the following formula below.

area = (3.14 * radius * radius)

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Program Listing

' Area of the Rectangle in 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  1:10 PM

Public Class Form1

    'Declaring constant value of PI of the circle

    Public Const PI = 3.14

    ' Compute Button

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

        Dim radius As Single = 0.0F

        Dim area As Single = 0.0F

        Dim radius_value As String

        radius_value = txtRadius.Text

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

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

            txtRadius.Focus()

        Else

            area = PI * Val(radius_value) * Val(radius_value)

            txtArea.Text = area.ToString("#####.##")

            txtArea.ReadOnly = True

        End If

    End Sub

    ' Clear Button

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

        txtRadius.Text = ""

        txtArea.Text = ""

        txtRadius.Focus()

    End Sub

    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()

            txtRadius.Text = ""

            txtArea.Text = ""

            txtRadius.Focus()

        End If

    End Sub

End Class