Factorial

#Factorial with Recursion

public int Factorial(int n)
{
 if (n == 0)
  return 1;
 else
  return n * Factorial(n-1);
} 

#Factorial without Recursion

int factorial ( int input )
{
  int x, fact = 1;
  for ( x = input; x > 1; x--)
     fact *= x;

  return fact;

}