C# Examples: Throwing an Exception

using System;

class Exercise
{
	static void Main()
	{
		double Operand1, Operand2;
		double Result = 0.00;
		char Operator;

		Console.WriteLine("This program allows you to perform an operation on two numbers");
		
		try 
		{
			Console.WriteLine("To proceed, enter a number, an operator, and a number:");
			Operand1 = double.Parse(Console.ReadLine());
			Operator = char.Parse(Console.ReadLine());
			Operand2 = double.Parse(Console.ReadLine());

			if( Operator != '+' && Operator != '-' && Operator != '*' && Operator != '/')
				throw new Exception(Operator.ToString());

			switch(Operator)
			{
				case '+':
					Result = Operand1 + Operand2;
					break;

				case '-':
					Result = Operand1 - Operand2;
					break;

				case '*':
					Result = Operand1 * Operand2;
					break;
	
				case '/':
					Result = Operand1 / Operand2;
					break;

				default:
					Console.WriteLine("Bad Operation");
					break;
			}
			Console.WriteLine("\n{0} {1} {2} = {3}", Operand1, Operator, Operand2, Result);
		}
		catch(Exception ex)
		{
			Console.WriteLine("\nOperation Error: {0} is not a valid operator", ex.Message);
		}
	}
}