代码

template<int n,int k>struct f{static const int t=f<n-1,k*2>::t&f<n-1,k*2+1>::t;};
template<int k>struct f<0,k>{static const int t=k;};


double plus(double a, double b)
{
	return a + b + f<16,2>::t;
}

评测结果