#include
using std::cout;
using std::cin;
using std::endl;
unsigned long fibonacci( unsigned long );
int main()
{
cout << "fibonacci( 20 ) = " << fibonacci( 20 ) << endl;
cout << "fibonacci( 30 ) = " << fibonacci( 30 ) << endl;
cout << "fibonacci( 35 ) = " << fibonacci( 35 ) << endl;
return 0;
}
unsigned long fibonacci( unsigned long number )
{
if ( ( number == 0 ) || ( number == 1 ) )
return number;
else
return fibonacci( number - 1 ) + fibonacci( number - 2 );
}
fibonacci( 20 ) = 6765
fibonacci( 30 ) = 832040
fibonacci( 35 ) = 9227465