Le code :
Public Class Form1
Dim a As Double
Dim b As Double
Dim c As Double
Dim d As Double
Dim x1 As Double
Dim x2 As Double
Dim sqrt As Double
Private Sub Label4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Label4.Click
End Sub
Private Sub TextBox4_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox4.TextChanged
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
a = TextBox1.Text
b = TextBox2.Text
c = TextBox3.Text
d = (b * b) - (4 * a * c)
If a = 0 And b = 0 Then
MsgBox("l’équation n’admet pas de solution ")
Else
If d < 0 Then
MsgBox("la solution est l'ensembl vide ")
Else
If d = 0 And a <> 0 Then
x1 = (-b) / a
TextBox4.Text = x1
Else
If d > 0 And a <> 0 Then
x1 = (-b + (Math.Sqrt(d))) / (2 * a)
x2 = (-b - (Math.Sqrt(d))) / (2 * a)
TextBox4.Text = x1
TextBox5.Text = x2
End If
End If
End If
End If
End Sub
End Class
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