private void Button_Click(object sender, RoutedEventArgs e)
{
try
{
firstNumber = double.Parse(first_number.Text);
}catch (FormatException ex)
{
Console.WriteLine(ex.Message);
return;
}
catch (ArgumentNullException ex)
{
Console.WriteLine(ex.Message);
return;
}catch (OverflowException ex)
{
Console.WriteLine(ex.Message);
return;
}
try
{
secondNumber = double.Parse(second_number.Text);
}
catch (FormatException ex)
{
Console.WriteLine(ex.Message);
return;
}
catch (ArgumentNullException ex)
{
Console.WriteLine(ex.Message);
return;
}
catch (OverflowException ex)
{
Console.WriteLine(ex.Message);
return;
}
string operation = operation_choice.Text.Trim();
double result;
switch (operation)
{
case "Divide":
result = calculator.Divide(firstNumber, secondNumber);
break;
case "Multiplication":
result = calculator.Multiply(firstNumber, secondNumber);
break;
case "Summation":
result = calculator.Add(firstNumber, secondNumber);
break;
case "Subtraction":
result = calculator.Subtract(firstNumber, secondNumber);
break;
default:
result = double.NaN;
break;
}
string resultString = result.ToString();
if (resultString.Length < 14)
{
result_box.Text = resultString;
}
else
{
result_box.Text = result.ToString().Substring(0, 13);
}
}
public void TestSubtraction()
{
Assert.AreEqual(12, calculator.Subtract(15, 3));
}