}; //无左括号
public override string Equal(string strOperator = "+", bool isEqualSign = false)
{
if (!isEqualSign)
{
if (canAddOperator(strOperator))
{
while (RightInput.Length > 0 && (RightInput.IndexOf('.') != -1 &&
sOperatorNum[sOperatorNum.Length - 1] == '0' ||
RightInput[RightInput.Length - 1] == '.'))//删除多余的"."和"0"
{
sOperatorNum = sOperatorNum.Substring(0, sOperatorNum.Length - 1);
RightInput = RightInput.Substring(0, RightInput.Length - 1);
}
sOperatorNum += strOperator;
RightInput = "";
}
}
else
{
if (!isExpressionHolds())
{
return(sOperatorNum);
}
var pts = new Parenthesis();//之后版本中用factory模式代替
pts.Expression = sOperatorNum;
sOperatorNum = pts.CalculatePostfixExp();
}
return(sOperatorNum);
}
public override string SetPoint()
{
if (RightInput.IndexOf(".") == -1)
{
if (RightInput.Length != 0)
{
RightInput += ".";
sOperatorNum += ".";
}
}
return(sOperatorNum);
}