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Imports System Module Program Class elem Public ope As String Public lev As Integer End Class Sub Main(args As String()) Dim inpstr As String = "6.1 + 5.2 * 4.3 - 3.4 / 2.5 * 1.6 " Dim rpnstr As String = "" Dim opeStack As New Stack Dim aelem As New elem While True If inpstr.Length = 0 Then GoTo owari End If Dim fSpacePosition As Integer = inpstr.IndexOf(" ") Dim fstr As String = inpstr.Substring(0, fSpacePosition) Dim nstr As String = Strings.Right(inpstr, inpstr.Length - fSpacePosition - 1) If Not (fstr = "+" Or fstr = "-" Or fstr = "*" Or fstr = "/") Then '演算子以外の数値は出力する rpnstr += fstr + " " Else If opeStack.Count >= 1 Then Dim wope As elem = opeStack.Peek Dim currentlev As Integer Select Case fstr Case "*" : currentlev = 2 Case "/" : currentlev = 2 Case "+" : currentlev = 1 Case "-" : currentlev = 1 Case Else : currentlev = 0 End Select Do While wope.lev >= currentlev And opeStack.Count >= 1 rpnstr += wope.ope + " " opeStack.Pop() If opeStack.Count > 0 Then wope = opeStack.Peek End If Loop Dim belem As New elem belem.ope = fstr belem.lev = currentlev opeStack.Push(belem) Else '最初のスタックへの積上げ If fstr = "+" Or fstr = "-" Then aelem.lev = 1 Else aelem.lev = 2 End If aelem.ope = fstr opeStack.Push(aelem) End If End If inpstr = nstr End While owari: Dim welem As elem Do While opeStack.Count > 0 welem = opeStack.Pop rpnstr += welem.ope + " " Loop Console.WriteLine(rpnstr) Console.WriteLine("Hello World!") End Sub End Module |
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