public bool PrepareArithmeticExpression(ArithmeticExpression expr)
{
bool res = (expr != null) && !string.IsNullOrWhiteSpace(mExpression);
if (res)
{
expr.Variables = mVariables;
expr.Expression = mExpression;
}
return(res);
}
static void Main(string[] args)
{
if (args.Length > 0)
{
var sp = new InputStringParser();
var ae = new ArithmeticExpression();
sp.InputString = args[0];
sp.PrepareArithmeticExpression(ae);
Console.WriteLine("{0} = {1}", ae.Expression, ae.Result);
}
else
{
Console.WriteLine("Enter an arithmetic expression in form \"EXPRESSION[;VAR1;VAR2;VAR3;...]\" as an argument,\ne.g.: (6.4 + 3.654) - a; a = 5.5\nSupported operations: +, -, *, /, %, ^, ~, ()");
}
}
private void Parse()
{
mVariables.Clear();
mExpression = "";
if (!string.IsNullOrWhiteSpace(mInputString))
{
string[] a = mInputString.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
foreach (string s in a)
{
if (s.Contains("="))
{
string[] ve = s.Split(new char[] { '=' }, StringSplitOptions.RemoveEmptyEntries);
if (ve.Length >= 2)
{
mVariables.Add(ve[0].Trim(), ArithmeticExpression.GetValue(ve[1].Trim()));
}
}
else
{
mExpression = s.Trim();
}
}
}
}
