private void Equals_Handle(object sender, RoutedEventArgs e)
{
if (_selectedOperator == SelectedOperator.Addition)
{
result = MathService.Addition(firstNumber, lastNumber);
DisplayResult.Text = result.ToString();
}
else if (_selectedOperator == SelectedOperator.Subtraction)
{
result = MathService.Subtract(lastNumber, firstNumber);
DisplayResult.Text = result.ToString();
}
else if (_selectedOperator == SelectedOperator.Division)
{
result = MathService.Divide(lastNumber, firstNumber);
DisplayResult.Text = result.ToString();
if (firstNumber == 0)
{
MessageBox.Show("Cannot divide by 0", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
DisplayResult.Text = "0";
firstNumber = 0;
lastNumber = 0;
_selectedOperator = null;
}
}
else if (_selectedOperator == SelectedOperator.Multiplication)
{
result = MathService.Multiply(lastNumber, firstNumber);
DisplayResult.Text = result.ToString();
}
lastNumber = result;
_selectedOperator = null;
}
private double?DoOperation(SelectedOperator?so, double o, double o1)
{
switch (so)
{
case SelectedOperator.Addition: return(MathService.Add(o, o1));
case SelectedOperator.Subtraction: return(MathService.Subtract(o, o1));
case SelectedOperator.Multiplication: return(MathService.Multiply(o, o1));
case SelectedOperator.Division: return(MathService.Divide(o, o1));
default: return(null);
}
}
private void Equal_Click(object sender, RoutedEventArgs e)
{
double number;
if (double.TryParse(Result.Content.ToString(), out number))
{
switch (selectedOperator)
{
case OperatorOptions.Division:
try
{
if (Result.Content.ToString() == "0")
{
throw new DivideByZeroException("Can't divide by 0");
}
result = MathService.Divide(lastNumber, number);
}
catch (DivideByZeroException ex)
{
MessageBox.Show("Connot divide by 0", "Error!");
lastNumber = 0;
}
break;
case OperatorOptions.Multiplication:
result = MathService.Multiply(lastNumber, number);
break;
case OperatorOptions.Addition:
result = MathService.Add(lastNumber, number);
break;
case OperatorOptions.Subtraction:
result = MathService.Subtract(lastNumber, number);
break;
}
Result.Content = result;
}
}
