public void Add(char op, int value)
{
Commander command = new CalculatorCommand(op, value, Calculator);
command.Run();
Commands.Add(command);
Total++;
}
public void Compute(char @operator, int operand)
{
// Create command operation and execute it
Command command = new CalculatorCommand(
_calculator, @operator, operand);
command.Execute();
// Add command to undo list
_commands.Add(command);
_current++;
}