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Function puissance(S1 As String, S2 As Long)
    puiss = "1"
    For i = 1 To S2
        puiss = multiplication(puiss & "", S1 & "")
    Next i
    puissance = puiss
End Function
Function multiplication(S1 As String, S2 As String) As String
 
If Len(S1) > Len(S2) Then 'S1 le plus petit
    temp = S2
    S2 = S1
    S1 = temp
End If
S3 = ""
S0 = ""
For i = Len(S1) To 1 Step -1
    S3 = add_string(multi(S2, Mid(S1, i, 1)) & S0, S3 & "")
    S0 = S0 & "0"
Next i
multiplication = S3
 
End Function
Function add_string(S1 As String, S2 As String) As String
    L1 = Len(S1)
    L2 = Len(S2)
    If L1 > L2 Then 'S1 le plus petit
        For i = L2 To L1 - 1
            S2 = "0" & S2
        Next i
    Else
        For i = L1 To L2 - 1
            S1 = "0" & S1
        Next i
    End If
    L1 = Len(S1)
    report = 0
    S = ""
    For i = L1 To 1 Step -1
        k = Mid(S1, i, 1) + report + Mid(S2, i, 1)
        S = k Mod 10 & S
        report = Int(k / 10)
    Next i
    S = report & S
    While Left(S, 1) = "0"
        S = Right(S, Len(S) - 1)
    Wend
    add_string = S
End Function
 
 
Function sub_string(S1 As String, S2 As String)
    L1 = Len(S1)
    L2 = Len(S2)
 
    If L1 > L2 Then 'S1 le plus petit
        For i = L2 To L1 - 1
            S2 = "0" & S2
        Next i
    ElseIf L2 > L1 Then '
        For i = L1 To L2 - 1
            S1 = "0" & S1
        Next i
    End If
 
    L1 = Len(S1)
    report = 0
    S = ""
 
    For i = L1 To 1 Step -1
        k = Mid(S1, i, 1) + report - Mid(S2, i, 1)
        report = 0
        While k < 0
            k = k + 10
            report = report + 1
        Wend
        S = k & S
    Next i
    S = report & S
 
    While Left(S, 1) = "0"
        S = Right(S, Len(S) - 1)
    Wend
    sub_string = S
End Function
Function mul2(S As String)
    S2 = ""
    report = 0
    For i = Len(S) To 1 Step -1
        k = Mid(S, i, 1) * 2
        S2 = (report + k) Mod 10 & S2
        report = Int(k / 10)
    Next i
    S2 = report & S2
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul2 = S2
End Function
Function mul3(S As String)
    S2 = ""
    j = Mid(S, Len(S), 1)
    k = 2 * (10 - j)
    If j Mod 2 = 1 Then k = k + 5
    report = Int(k / 10)
    k = k Mod 10
    S2 = k & S2
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = (9 - j) * 2 + Int(j2 / 2) + report
        If j Mod 2 = 1 Then k = k + 5
 
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    j = Mid(S, 1, 1)
    k = Int(j / 2) - 2 + report
    S2 = k & S2
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul3 = S2
End Function
Function mul4(S As String)
    S2 = ""
    j = Mid(S, Len(S), 1)
    k = (10 - j)
    If j Mod 2 = 1 Then k = k + 5
    report = Int(k / 10)
    k = k Mod 10
    S2 = k & S2
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = 9 - j + Int(j2 / 2) + report
        If j Mod 2 = 1 Then k = k + 5
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    j = Mid(S, 1, 1)
    k = Int(j / 2) - 1 + report
    S2 = k & S2
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul4 = S2
End Function
Function mul5(S As String)
    S2 = ""
    S = "0" & S
    j = Mid(S, Len(S), 1)
    If j Mod 2 = 1 Then
        S2 = "5"
    Else
        S2 = "0"
    End If
    report = 0
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = Int(j2 / 2) + report
        If j Mod 2 = 1 Then k = k + 5
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul5 = S2
End Function
Function mul6(S As String)
    S2 = ""
    S = "0" & S
    j = Mid(S, Len(S), 1)
    If j Mod 2 = 1 Then
        k = j + 5
    Else
        k = j
    End If
    report = Int(k / 10)
    k = k Mod 10
    S2 = k & S2
 
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = j + Int(j2 / 2) + report
        If j Mod 2 = 1 Then k = k + 5
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul6 = S2
End Function
Function mul7(S As String)
    S2 = ""
    S = "0" & S
    j = Mid(S, Len(S), 1)
    If j Mod 2 = 1 Then
        k = 2 * j + 5
    Else
        k = 2 * j
    End If
    report = Int(k / 10)
    k = k Mod 10
    S2 = k & S2
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = 2 * j + Int(j2 / 2) + report
        If j Mod 2 = 1 Then k = k + 5
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul7 = S2
End Function
Function mul8(S As String)
    S2 = ""
    k = 20 - 2 * Mid(S, Len(S), 1)
    report = Int(k / 10)
    k = k Mod 10
    S2 = k & S2
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = (9 - j) * 2 + j2 + report
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    j = Mid(S, 1, 1)
    k = j - 2 + report
    S2 = k & S2
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul8 = S2
End Function
Function mul9(S As String)
    S2 = ""
    k = 10 - Mid(S, Len(S), 1)
    report = Int(k / 10)
    k = k Mod 10
    S2 = k & S2
    For i = Len(S) - 1 To 1 Step -1
        j = Mid(S, i, 1)
        j2 = Mid(S, i + 1, 1)
        k = (9 - j) + j2 + report
        report = Int(k / 10)
        k = k Mod 10
        S2 = k & S2
    Next i
    j = Mid(S, 1, 1)
    k = j - 1 + report
    S2 = k & S2
    While Left(S2, 1) = "0"
        S2 = Right(S2, Len(S2) - 1)
    Wend
    mul9 = S2
End Function
 
Function mul10(S As String)
    mul10 = S & "0"
End Function
Function multi(S As String, C As String)
    Select Case C
    Case "0"
        multi = "0"
    Case "1"
     multi = S
    Case "2"
        multi = mul2(S)
    Case "3"
        multi = mul3(S)
    Case "4"
        multi = mul4(S)
    Case "5"
        multi = mul5(S)
    Case "6"
        multi = mul6(S)
    Case "7"
        multi = mul7(S)
    Case "8"
        multi = mul8(S)
    Case "9"
        multi = mul9(S)
    End Select
End Function
'codé par Gorzyne pour Developpez.net | 
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