1   // Fig. 3.14: fig03_14.cpp
2   // Recursive factorial function
3   #include <iostream.h>
4   #include <iomanip.h>
5   
6   unsigned long factorial( unsigned long );
7   
8   int main()
9   {
10     for ( int i = 0; i <= 10; i++ )
11        cout << setw( 2 ) << i << "! = " << factorial( i ) << endl;
12  
13     return 0;
14  }
15  
16  // Recursive definition of function factorial
17  unsigned long factorial( unsigned long number )
18  {
19     if ( number <= 1 )  // base case
20        return 1;
21     else                // recursive case
22        return number * factorial( number - 1 ); 
23  }