protected int Precedence(EqnElement Elmnt)
{
switch (Elmnt.elmType)
{
case Type.Bracket:
return(5);
case Type.Function:
return(4);
case Type.Comma:
return(0);
}
switch (Elmnt.strName)
{
case "^":
return(3);
case "/":
case "*":
case "%":
return(2);
case "+":
case "-":
return(1);
}
return(-1);
}
protected EqnElement Evaluate(EqnElement Elmnt1, EqnElement opr, EqnElement Elmnt2)
{
EqnElement result;
result.strName = Elmnt1.strName + opr.strName + Elmnt2.strName;
result.elmType = Type.Result;
result.dblValue = 0;
switch (opr.strName)
{
case "^":
result.dblValue = System.Math.Pow(Elmnt1.dblValue, Elmnt2.dblValue);
break;
case "/":
{
if (Elmnt2.dblValue > 0)
{
result.dblValue = Elmnt1.dblValue / Elmnt2.dblValue;
}
else
{
result.strName = "Divide by Zero.";
result.elmType = Type.Error;
}
break;
}
case "*":
result.dblValue = Elmnt1.dblValue * Elmnt2.dblValue;
break;
case "%":
result.dblValue = Elmnt1.dblValue % Elmnt2.dblValue;
break;
case "+":
result.dblValue = Elmnt1.dblValue + Elmnt2.dblValue;
break;
case "-":
result.dblValue = Elmnt1.dblValue - Elmnt2.dblValue;
break;
default:
result.elmType = Type.Error;
result.strName = "Undefine operator: " + opr.strName + ".";
break;
}
if (result.dblValue.ToString(System.Globalization.CultureInfo.InvariantCulture).Contains("E-"))
{
result.dblValue = 0;
}
return(result);
}
