Create a factorial program that reports illegal Factorial() arguments using an Exception. - CSharp Data Structure Algorithm

CSharp examples for Data Structure Algorithm:Factorial

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Description

Create a factorial program that reports illegal Factorial() arguments using an Exception.

Demo Code

using System;/*from  w ww .  j  a  va2 s. co m*/
public class MyMathFunctions
{
   public static int Factorial(int value)
   {
      if (value < 0)
      {
         string s = String.Format("Illegal negative argument to Factorial {0}", value);
         throw new ArgumentException(s);
      }
      int factorial = 1;
      do
      {
         factorial *= value;
      } while(--value > 1);
      return factorial;
   }
}
public class Program{
   public static void Main(string[] args)
   {
      try
      {
         for (int i = 6; i > -6; i--)
         {
            int factorial = MyMathFunctions.Factorial(i);
            Console.WriteLine("i = {0}, factorial = {1}",i, factorial);
         }
      }
      catch(ArgumentException e)
      {
         Console.WriteLine("Fatal error:");
         Console.WriteLine(e.ToString());
      }
   }
}

Result


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