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