using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();

// Define a variable once during rule initialization
t.FromTo("init_math", "{@Define: Variable: my_pi = 3.14}Math Initialized");
t.FromTo("Eval: {expr}", "{@@Eval: expr}");
Console.WriteLine(t.Transform("init_math"));
Console.WriteLine(t.Transform("Eval: my_pi * 2"));