using uCalcSoftware;

var uc = new uCalc();
uc.DefineConstant("LOCKED_VAL = 1000");
Console.WriteLine($"Initial value: {uc.Eval("LOCKED_VAL")}");

// 1. End-user attempts to assign a value. This should fail.
uc.Eval("LOCKED_VAL = 2000");
Console.WriteLine($"Error after assignment attempt: {uc.Error.Message}");
Console.WriteLine($"Value remains unchanged: {uc.Eval("LOCKED_VAL")}");