Sunday, June 28, 2020

Prime Number Checker in VB.NET

I wrote this program using Microsoft Visual Basic NET to ask the user to give a number and then the program will check if the given number is a prime number or not.

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Sample Program Output


Program Listing

Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim i, j As Integer
        Dim t As Boolean
        i = Val(TextBox1.Text)
        t = True
        For j = 2 To (i - 1)
            If i Mod j = 0 Then
                t = False
                Exit For
            End If
        Next j
        If t Then
            MsgBox("The given number " & i & " is a Prime Number.")
            TextBox1.Focus()
        Else
            MsgBox("The given number " & i & " is not a Prime Number")
            TextBox1.Focus()
        End If
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        If MsgBox("Are you sure you want to quit?", vbYesNo + vbQuestion, "Quit") = vbYes Then
            Me.Close()
        Else
            Me.Show()
            TextBox1.Text = ""
            TextBox1.Focus()
        End If
    End Sub

End Class



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