Add all the natural numbers below one thousand that are multiples of 3 or 5.

On the walk home, I found myself thinking about the problem and I wondered if it would be possible to use C++ template meta-programming to obtain the solution at compile time. Here's what I came up with:

template< int n >

struct sum_integers_up_to

{

static const int result =

(n * (n + 1)) / 2;

};

template< int upper_limit, int x >

struct sum_multiples

{

static const int result =

x * sum_integers_up_to< (upper_limit - 1)/ x >::result;

};

template< int upper_limit, int x, int y >

struct sum_two_multiples

{

static const int sum_of_multiples_of_x =

sum_multiples< upper_limit, x >::result;

static const int sum_of_multiples_of_y =

sum_multiples< upper_limit, y >::result;

static const int sum_of_multiples_of_xy =

sum_multiples< upper_limit, x*y >::result;

static const int result =

sum_of_multiples_of_x + sum_of_multiples_of_y - sum_of_multiples_of_xy;

};

int main()

{

return sum_two_multiples< 1000, 3, 5 >::result;

}

Having a look at the assembly code generated by MSVC, we see that it's about as minimal as it gets (spoiler alert!):

_main PROC

mov eax, 233168

ret 0

_main ENDP

One down, 328 to go...

## 2 comments:

Whether you need to guess on esports events held in Seoul, soccer fixtures within the K League or the most recent recreation within the KBO League, this page incorporates a list of the most effective Korean 코인카지노 betting sites assist you|that will help you|that can assist you} get began. The South Korean police uncovered unlawful on-line gambling operations, which have been operating four gambling web sites since 2018. Poker followers are additionally not left behind with webcam know-how, they can additionally play stay poker on the consolation of their home.

Unlike sports activities betting, on-line on line casino playing remained unlawful in Illinois, and Jason wasn’t sure if the online video games he was taking part in} had been legal or not. “But there was never any red tape to get past in order to to} play those video games,” he said. In mixture with different parts of playing, such because the potential of profitable, the enjoyment of taking part in} and the social participation of the experience, dopamine triggers the brain’s reward system. In some people, this reward system could compel them 원 엑스 벳 to keep betting beyond their meant limits to experience those constructive emotions.

## Post a Comment