cuihao->blog

刚才无意中看到一篇文章 http://ceeji.net/blog/mod-in-real
在评论里看到，这是两种除法的定义方式。

其实不完全正确。在 C99 之前 C 语言的取整是未定义的，不同架构上不同的编译器都可能导致完全不同的结果，而且这个结果多半是在这种硬件上最快的。

C 语言规范请查阅 C89 (ANSI C) 和 C99 的 ISO 文档。K&R 第二版是 ANSI C，有些对于 C99 来说已经不正确了。

C89 中，-22 / 7 = -3, -22 % 7 = -1，也可以-22 / 7= -4, -22 % 7 = 6。 而C99中明确为 -22 / 7 = -3, -22 % 7 = -1，只有一种结果。

python3有些不同了
cecil@cecil-Aspire-4750:~$ python3
Python 3.2.3 (default, Oct 19 2012, 20:13:42)
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> -14/3
-4.666666666666667
>>> -14%3
1

很基础，总结的不错

很多语言都有点相关，但是在运算时总是又有差异。我做app的时候，以常遇到这些问题。思路是很好的

这个在Graham & Knuth的"Concrete Mathematics"里有讲过，书里的定义结果是向下取整。记得Guido van Rossum也写过一篇文章讲原因。

a mod b = a - b * floor(a / b)

书中floor(x)的定义本身也为向下（负无穷方向）取整。

记错了。

http://python-history.blogspot.com/2010/08/why-pythons-integer-division-floors.html

这样算好像有语法错误，中断结果

两数相除,同号得正,异号得负,并把绝对值相除,0除以任何一个不等于0的数,都得0.
很明显在数学方面来看取整应该是向0的,因为0没有符号.
判断的时候判断模比较符合数学规则,显然pyhon有点问题

Cool stuff you have and you keep overhaul every one of us

The PCSO Lotto Result today and yesterday this October 2023 is here! Refresh page for official winning numbers - 6/58, 6/55, 6/49, 6/45, 6/42, Swertres 

Admiring the time and effort you put into your blog and detailed information you offer!.

The PCSO Lotto Result today and yesterday this October 2023 is here! Refresh page for official winning numbers - 6/58, 6/55, 6/49, 6/45, 6/42, Swertres 

Such a very useful article. Very interesting to read this article.I would like to thank you for the efforts you had made for writing this awesome article.

Thanks for a very interesting blog. What else may I get that kind of info written in such a perfect approach? I’ve a undertaking that I am simply now operating on, and I have been at the look out for such info

I’ve read some good stuff here. Definitely worth bookmarking for revisiting. I surprise how much effort you put to create such a great informative website.

Thank you so much as you have been willing to share information as ABC.

Nice to be visiting your blog again, it has been months for me. Well this article that i've been waited for so long. I need this article to complete my assignment in the college, and it has the same topic with your article. Thanks, great share 

I am very happy to discover your post as it will become on top in my collection of favorite blogs to visit

I feel very grateful that I read this. It is very helpful and very informative and I really learned a lot from it.

I basically need to reveal to you that I am new to weblog and certainly enjoyed this blog webpage. Likely I'm going to bookmark your blog . You totally have superb stories. Supports imparting to us your blog.

I've found this interesting! Check it out!

I got too much interesting stuff on your blog. I guess I am not the only one having all the enjoyment here! Keep up the good work

I am very happy to discover your post as it will become on top in my collection of favorite blogs to visit

Awesome Website. Keep up the good work.

Thank you so much as you have been willing to share information with us. We will forever admire all you have done here because you have made my work as easy as ABC.

Every one of the substance you said in post is too great and can be extremely helpful. I will remember it, much obliged for sharing the data continue upgrading, looking forward for more posts.Thanks . Decent to be going to your web

I think that thanks for the valuabe information and insights you have so provided here. 

That appears to be excellent however i am still not too sure that I like it. At any rate will look far more into it and decide personally

Thanks for every other informative site. The place else may just I get that kind of information written in such an ideal means? I have a venture that I’m just now operating on, and I have been on the look out for such information 

Thank you so much as you have been willing to share information with us. We will forever admire all you have done here because you have made my work as easy as ABC.

I've found this interesting! Check it out!

This is actually the kind of information I have been trying to find. Thank you for writing this information

I basically need to reveal to you that I am new to weblog and certainly enjoyed this blog webpage. Likely I'm going to bookmark your blog . You totally have superb stories. Supports imparting to us your blog.

Awesome Website. Keep up the good work.

It's always exciting to read articles from other writers and practice something from their web sites 

I think this is a really good article. You make this information interesting and engaging. You give readers a lot to think about and I appreciate that kind of writing

I’m happy I located this blog! From time to time, students want to cognitive the keys of productive literary essays composing. Your first-class knowledge about this good post can become a proper basis for such people. nice one 

This is such a great resource that you are providing and you give it away for free. I love seeing blog that understand the value of providing a quality resource for free

Admiring the time and effort you put into your blog and detailed information you offer!.

This is such a great resource that you are providing and you give it away for free. I love seeing blog that understand the value of providing a quality resource for free

Really a great addition. I have read this marvelous post. Thanks for sharing information about it. I really like that 

I feel very grateful that I read this. It is very helpful and very informative and I really learned a lot from it.

This is such a great resource that you are providing and you give it away for free. I love seeing blog that understand the value of providing a quality resource for free

Thanks for every other informative site. The place else may just I get that kind of information written in such an ideal means? I have a venture that I’m just now operating on, and I have been on the look out for such information 

I basically need to reveal to you that I am new to weblog and certainly enjoyed this blog webpage. Likely I'm going to bookmark your blog . You totally have superb stories. Supports imparting to us your blog.

Thanks for sharing this information. I really like your blog post very much. You have really shared a informative and interesting blog post with people

This is a truly good site post. Not too many people would actually, the way you just did. I am really impressed that there is so much information about this subject that have been uncovered and you’ve done your best, with so much class. If wanted to know more about green smoke reviews, than by all means come in and check our stuff.

this is really good website, coolest I have ever visit thank you so much, i will follow and stay tuned much appriciated

I enjoy looking through an article that will make people think. Also, thank you for allowing for me to comment

Great job for publishing such a beneficial web site. Your web log isn’t only useful but it is additionally really creative too. There tend to be not many people who can certainly write not so simple posts that artistically. Continue the nice

V

I definitely enjoying every little bit of it and I have you bookmarked to check out new stuff you post

I simply want to tell you that I am new to weblog and definitely liked this blog site. Very likely I’m going to bookmark your blog . You absolutely have wonderful stories. Cheers for sharing with us your blog.

You there, this is really good post here. Thanks for taking the time to post such valuable information. Quality content is what always gets the visitors coming

I can suggest essentially not too bad and even dependable tips, accordingly see it: 

This was very informative

Acknowledges for paper such a beneficial composition, I stumbled beside your blog besides decipher a limited announce. I want your technique of inscription…

I feel a lot more people need to read this, very good info!

온라인 카지노 커뮤니티 온카허브 입니다. 온카허브는 카지노 먹튀 사이트들과 안전한 카지노 사이트 정보를 공유하고 있습니다. 카지노 먹튀검증 전문팀을 자체적으로 운영함으로써 철저한 검증을 진행하고 있습니다.

온라인 카지노 커뮤니티 온카허브 입니다. 온카허브는 카지노 먹튀 사이트들과 안전한 카지노 사이트 정보를 공유하고 있습니다. 카지노 먹튀검증 전문팀을 자체적으로 운영함으로써 철저한 검증을 진행하고 있습니다.
https://oncahub24.com/

바카라 바카라사이트 우리카지노 카지노는 바카라, 블랙잭, 룰렛 및 슬롯 등 다양한 게임을 즐기실 수 있는 공간입니다. 게임에서 승리하면 큰 환호와 함께 많은 당첨금을 받을 수 있고, 패배하면 아쉬움과 실망을 느끼게 됩니다.

하노이 꼭 가봐야 할 베스트 업소 추천 안내 및 예약, 하노이 밤문화 에 대해서 정리해 드립니다. 하노이 가라오케, 하노이 마사지, 하노이 풍선바, 하노이 밤문화를 제대로 즐기시기 바랍니다. 하노이 밤문화 베스트 업소 요약 베스트 업소 추천 및 정리.

No.1 먹튀검증 사이트, 먹튀사이트, 검증사이트, 토토사이트, 안전사이트, 메이저사이트, 안전놀이터 정보를 제공하고 있습니다. 먹튀해방으로 여러분들의 자산을 지켜 드리겠습니다. 먹튀검증 전문 커뮤니티 먹튀클린만 믿으세요!!

베트남 남성전용 커뮤니티❣️ 베트남 하이에나 에서 베트남 밤문화를 추천하여 드립니다. 베트남 가라오케, 베트남 VIP마사지, 베트남 이발관, 베트남 황제투어 남자라면 꼭 한번은 경험 해 봐야할 화끈한 밤문화로 모시겠습니다. 

This article is an appealing wealth of informative data that is interesting and well-written

온라인 카지노 커뮤니티 온카허브 입니다. 온카허브는 카지노 먹튀 사이트들과 안전한 카지노 사이트 정보를 공유하고 있습니다. 카지노 먹튀검증 전문팀을 자체적으로 운영함으로써 철저한 검증을 진행하고 있습니다

The tech-original mission is to help you better understand technology, and make better decisions in the fields of IT, Tech, and Crypto.
https://www.tech-original.com/

The tech-original mission is to help you better understand technology, and make better decisions in the fields of IT, Tech, and Crypto.
https://www.tech-original.com/