逆波兰式表达式计算引擎

逆波兰式表达式计算引擎ReversePolishExpressionToolV1.0.1Feature1.Attention!theinputexpressionisn'tallowedtoconstantsInvalidCharacterslike'_、#'2.It'ssupportedthecalculationofdiv(/)mod(%)sqrt(_)mul(*)sub(-)pow(^)3.TheUsage:thereisneedlytwoHashMap.Oneastheinputparamt