private void addButton_Click(object sender, EventArgs e)
{
expressionLbl.Text += String.IsNullOrEmpty(displayTxt.Text) ? Constants.Add : displayTxt.Text + Constants.Add;
var number = new Number
{
EnteredNumber = String.IsNullOrEmpty(displayTxt.Text) ? 0 : Convert.ToDouble(displayTxt.Text),
IsCalculated = false
};
AddCommand addCommand;
//Deferred execution
if (_bracketCount == 0 || _bracketCount % 2 == 0)
{
_numbers.Add(number);
addCommand = new AddCommand(_result, _numbers);
//Calculating
_invoker.CalculatingOperations();
}
else if (_bracketCount > 0 && _bracketCount % 2 == 0)
{
_bracketNumbers.Add(number);
addCommand = new AddCommand(_result, _bracketNumbers);
_invoker.CalculatingOperations();
}
else
{
_bracketNumbers.Add(number);
addCommand = new AddCommand(_result, _bracketNumbers);
}
//Adding current operation into sequence
_invoker.IncludeOperations(addCommand);
displayTxt.Clear();
}
public void TestSquareRoot()
{
var invoker = new CommandInvoker();
var result = new ResultReceiver();
var number = new Number {
EnteredNumber = 4, IsCalculated = false
};
invoker.IncludeOperations(new SquareRootCommand(result, number));
invoker.CalculatingOperations();
Assert.AreEqual(2.0, result.Answer);
}
public void TestAddAndSub()
{
var invoker = new CommandInvoker();
var result = new ResultReceiver();
var addNumbers = new List <Number>
{
new Number {
EnteredNumber = 1, IsCalculated = false
},
new Number {
EnteredNumber = 2, IsCalculated = false
}
};
var addCommand = new AddCommand(result, addNumbers);
invoker.IncludeOperations(addCommand);
invoker.CalculatingOperations();
Assert.AreEqual(3.0, result.Answer);
invoker.RemoveOperation(addCommand);
var subNumbers = new List <Number>
{
new Number {
EnteredNumber = 3, IsCalculated = false
}
};
invoker.IncludeOperations(new SubtractCommand(result, subNumbers));
invoker.CalculatingOperations();
Assert.AreEqual(0.0, result.Answer);
invoker.RemoveOperation(addCommand);
}
public void TestDivide()
{
var invoker = new CommandInvoker();
var result = new ResultReceiver();
var numbers = new List <Number>
{
new Number {
EnteredNumber = 4, IsCalculated = false
},
new Number {
EnteredNumber = 2, IsCalculated = false
}
};
invoker.IncludeOperations(new DivideCommand(result, numbers));
invoker.CalculatingOperations();
Assert.AreEqual(2.0, result.Answer);
}
