Beispiel #1
0
        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;
        }
Beispiel #2
0
        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;
            }
        }