11.    Find the factorial of number

      int Factorial( int Num )

      {

      If ( num > 0 )    return Num * Factorial ( Num –1 ); 

 else

                      return 1;

        }

// iterative version

      int Factorial( int Num )

      {

                      int I

                      int result = 1;

       

for ( I= Num; I > 0; I-- )

{

                                      result = result * I;

} 

 return result;

}