// Fig. 7.17: FactorialTest.cs
// Recursive Factorial method.
using System;

public class FactorialTest 
{ 
   public static void Main( string[] args )
   {
      // calculate the factorials of 0 through 10
      for ( long counter = 0; counter <= 10; counter++ )
         Console.WriteLine( "{0}! = {1}", 
            counter, Factorial( counter ) );
   } // end method Main
   
   // recursive declaration of method Factorial  
   public static long Factorial( long number )          
   {                                             
      // base case                               
      if ( number <= 1 )                         
         return 1;                                                              
      // recursion step                          
      else                                       
         return number * Factorial( number - 1 );                                               
   } // end method Factorial                     
} // end class FactorialTest

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