public string Clear()
{
var command = new CalculatorCommand(_calculator, 'C', 0);
var executionResult = command.Clear();
_commands.Clear();
CurrentValue = 0;
return(executionResult);
}
public string Compute(char @operator, int operand)
{
var command = new CalculatorCommand(_calculator, @operator, operand);
var executionResult = command.Execute();
_commands.Add(command);
CurrentValue++;
return(executionResult);
}