static double method1(int x)
{
try
{
double result1 = method2(x);
return(result1);
}
catch (OddNumberException oddex)
{
if (x < 0)
{
NegativeNumberException nne = new NegativeNumberException("negative input value", oddex);
throw nne;
}
return(0); // force method to return something
}
}
static void Main(string[] args)
{
while (true)
{
//clear screen
Console.Clear();
//display menu
Menu();
//get user selection
int selection;
Console.Write("\n\t\tEnter your selection: ");
int.TryParse(Console.ReadLine(), out selection);
switch (selection)
{
case 1:
{
try
{
Console.Write("Enter first integer: ");
int x = int.Parse(Console.ReadLine()); // possible problems: Out of range; or not digits
Console.Write("\nEnter second integer: ");
int y = int.Parse(Console.ReadLine());
int result = x / y; // possible problem: divide by zero; over/underflow
Console.WriteLine($"{x} / {y} = {result}.");
}
catch (FormatException fe)
{
Console.WriteLine(fe.Message);
}
catch (OverflowException oe)
{
Console.WriteLine(oe.Message);
}
catch (Exception ex) // this will catch all Exception classes
{
Console.WriteLine($"Something went wrong ==>>\n{ex.Message}");
}
}
break;
case 2:
{
try
{
Console.Write("Enter a positive integer: ");
int x = int.Parse(Console.ReadLine()); // possible problems: sqare of a negative number
if (x < 0)
{
//Console.WriteLine("Throw an exception here.");
NegativeNumberException nne = new NegativeNumberException();
throw nne;
}
else
{
double result = Math.Sqrt(x); // possible problem: divide by zero; over/underflow
Console.WriteLine($"Math.Sqrt{x} = {result}.");
}
}
catch (Exception ex)
{
Console.WriteLine($"{ex.Message}");
}
}
break;
case 3:
{
// define a method that throws the OddNumberException
// the method is to divide the number by 2 and return the result
// or throw the OddNumberException if the input parameter is odd
// get user input. call the method. display result.
try
{
{
Console.Write("Input an even number: ");
int x = int.Parse(Console.ReadLine());
if (x % 2 != 0)
{
Console.WriteLine("Throw an error.");
OddNumberException one = new OddNumberException();
throw one;
}
else
{
int result = DivideByTwo(x);
Console.Write($"The solution is: {result}");
}
}
}
catch (Exception ex)
{
Console.WriteLine($"{ex.Message}");
}
}
break; //do NOT add the break within the Try/Catch
case 4:
// call a method that calls another method, each with their own single arg values
// Method 1 throws an Exception and calls Method 2 which throws another Exception
{
try
{
Console.Write("Input an even number: ");
int x = int.Parse(Console.ReadLine());
double result = method1(x);
}
catch (NegativeNumberException nne)
{
Console.WriteLine($"\n{nne.GetType().Name}: {nne.Message}");
if (nne.InnerException != null)
{
Exception innerException = nne.InnerException;
Console.WriteLine($"{innerException.GetType().Name}: {innerException.Message}");
}
}
}
break;
case 5:
{ }
break;
case 9: //exit
return;
}
//pause for the results
Console.Write("\n\nHit <Enter> to continue");
Console.ReadLine();
}
}