57 lines
1.1 KiB
Text
57 lines
1.1 KiB
Text
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Function RPN(expr As String) As String
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Dim tokenArray() As String
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Dim stack() As String
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Dim Wert1 As Double
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Dim Wert2 As Double
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'Initialize array (removed later)
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ReDim tokenArray(1)
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ReDim stack(1)
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tokenArray = Split(expr, " ")
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Dim i As integer
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i = 0
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While i <= tokenArray.Ubound
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If tokenArray(i) = "+" Then
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Wert2 = Val(stack.pop)
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Wert1 = Val(stack.pop)
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stack.Append(Str(Wert1+Wert2))
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ElseIf tokenArray(i) = "-" Then
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Wert2 = Val(stack.pop)
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Wert1 = Val(stack.pop)
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stack.Append(Str(Wert1-Wert2))
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ElseIf tokenArray(i) = "*" Then
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Wert2 = Val(stack.pop)
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Wert1 = Val(stack.pop)
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stack.Append(Str(Wert1*Wert2))
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ElseIf tokenArray(i) = "/" Then
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Wert2 = Val(stack.pop)
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Wert1 = Val(stack.pop)
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stack.Append(Str(Wert1/Wert2))
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ElseIf tokenArray(i) = "^" Then
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Wert2 = Val(stack.pop)
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Wert1 = Val(stack.pop)
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stack.Append(Str(pow(Wert1,Wert2)))
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Else
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stack.Append(tokenArray(i))
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End If
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i = i +1
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Wend
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Return stack(2)
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End Function
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