Язык VBA:

Function Bin(s As String, z As Integer) As String
Dim c As Integer
Dim oct As Integer
c = Val(s)
Do
    oc = c Mod 2
    c = c 2
    Bin = Bin & Str(oc)
Loop Until c = 0
Bin = StrReverse(Bin)
If z = -1 Then Bin = "-" & Bin
End Function

Sub z()
Dim s As String, s1 As String
Dim n As Integer, i As Integer, z As Integer
Dim max
s = InputBox("Введите строку: ")
max = Null
i = 1
Do While i <= Len(s)
    Select Case Mid(s, i, 1)
       Case 0 To 9
          If z = 0 And i > 1 Then
             z = IIf(Mid(s, i - 1, 1) = "-", -1, 1)
          Else: z = 1
          End If
          s1 = s1 + Mid(s, i, 1)
          If i = Len(s) Then GoSub 1
       Case Else:
         If s1 <> "" Then GoSub 1
    End Select
    i = i + 1
Loop
MsgBox ("max=" & max)
End
1:          n = z * Val(s1)
             MsgBox (n & "; двоичная форма: " & Bin(s1, z))
             If IsNull(max) Then max = n
             If max < n Then max = n
             z = 0
             s1 = ""
             Return
End Sub