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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim tmpe, tmpa As Double
If IsNumeric(Me.TextBox1.Text) = False Then Exit Sub
tmpa = System.Convert.ToDouble(Me.TextBox1.Text)
tmpe = Factorielle(tmpa)
MsgBox(tmpe.ToString)
End Sub
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Function Factorielle(ByVal N As Long) As Double
Dim i, Resultat As Double
Resultat = 1
For i = 1 To N
Resultat = i * Resultat
Next i
Return Resultat
End Function
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