private void ExecuteaddOperandAndOperator(object parameter)
{
//switch case to check any special function in default assign value to display property
try
{
switch (parameter.ToString())
{
case "c": //clear and reset everything
buildDisplayInput.Clear();
CompleteEquation.Clear();
firstOperand = null;
selectedOperator = string.Empty;
Display = string.Empty;
DisplayCompleteEquation = "0";
break;
case "+/-":
if (Display != string.Empty && Display != "0" && Display != null)
{
if (!Display.Contains("-"))
{
Display = "-" + Display;
}
else
{
Display = Display.Remove(0, 1);
}
}
break;
case "%":
if (Display == null)
{
Display = "0";
}
{
double percentageConverstion = double.Parse(Display) / 100;
Display = percentageConverstion.ToString();
}
break;
case ".":
Display = Display + ".";
break;
default:
if (isNewOperand == false)
{
Display = Display + parameter.ToString();
}
else if (isNewOperand == true)
{
Display = string.Empty;
Display = Display + parameter.ToString();
isNewOperand = false;
}
//creating complete equation for displaying
CompleteEquation.Add(parameter.ToString());
buildDisplayInput.Clear();
foreach (string dis in CompleteEquation)
{
buildDisplayInput.Append(dis);
}
DisplayCompleteEquation = buildDisplayInput.ToString();
break;
}
}
catch (Exception e)
{
MessageBox.Show("{0}", e.ToString());
}
}
private void ExecuteBasicOperator(object parameter)
{
try
{
isNewOperand = true;
if (parameter.ToString() != "=" && selectedOperator == string.Empty)
{
selectedOperator = parameter.ToString();
//isFirstOperator = false;
}
if (firstOperand == null)
{
firstOperand = Display;
}
else
{
secondOperand = Display;
if (firstOperand != null && secondOperand != null)
{
firstOperand = objModel.calculateResult(firstOperand, secondOperand, selectedOperator);
}
Display = objModel.Result.ToString();
if (parameter.ToString() != "=")
{
selectedOperator = parameter.ToString();
}
}
if (parameter.ToString() == "=")
{
//resetting the value to default
buildDisplayInput.Clear();
CompleteEquation.Clear();
firstOperand = null;
selectedOperator = string.Empty;
//replacing complete eqaution value with the results after "="
DisplayCompleteEquation = objModel.Result.ToString();
CompleteEquation.Add(DisplayCompleteEquation);
}
else
{
if (firstOperand != null)
{
CompleteEquation.Add(parameter.ToString());
buildDisplayInput.Clear();
foreach (string dis in CompleteEquation)
{
buildDisplayInput.Append(dis);
}
DisplayCompleteEquation = buildDisplayInput.ToString();
}
}
}
catch (Exception e)
{
MessageBox.Show("{0}", e.ToString());
}
}
