public static ExprVarValue Parse(string s)
{
ExprVarValue res;
int i = 0;
Buttons ButtonType;
string button;
button = ButtonFunctions.ParseNextButton(s, ref i, out ButtonType);
if (ButtonType != Buttons.Letter)
{
throw new Exception();
}
res.Name = button;
button = ButtonFunctions.ParseNextButton(s, ref i, out ButtonType);
if (button != "=")
{
throw new Exception();
}
res.Value = ExpressionTree.Build(s, ref i);
return(res);
}
static void Main(string[] args)
{
// sort out more complex examples
string s = "2+2";
ExpressionTree e = ExpressionTree.Build(s);
ExprVarValue[] vars = { new ExprVarValue("x", 2), new ExprVarValue("y", 3) };
Console.WriteLine(s);
foreach (ExprVarValue var in vars)
{
Console.WriteLine(var);
}
Console.Write(e.ToString() + " = ");
Console.WriteLine(e.getValue(vars));
Console.ReadKey();
}