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

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