大约有 40,000 项符合查询结果(耗时:0.0347秒) [XML]

https://www.tsingfun.com/it/cp... 

浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C++内核技术

...:大家面试的时候可能会经常遇到考察浮点数与零比较的问题,是简单的 f == 0 吗?当然不是,正确的写法应该是f > -1e-7 && f < 1e-7,为什么呢? 浮点型,由于精度关系(float精度:2^23 = 8388608,一共7位,同理double 16位),最小分...
https://www.tsingfun.com/it/cp... 

浮点数在内存中的表示 - C/C++ - 清泛网移动版 - 专注C++内核技术

...:大家面试的时候可能会经常遇到考察浮点数与零比较的问题,是简单的 f == 0 吗?当然不是,正确的写法应该是f > -1e-7 && f < 1e-7,为什么呢? 浮点型,由于精度关系(float精度:2^23 = 8388608,一共7位,同理double 16位),最小分...
https://www.tsingfun.com/it/cp... 

浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C/C++及内核技术

...:大家面试的时候可能会经常遇到考察浮点数与零比较的问题,是简单的 f == 0 吗?当然不是,正确的写法应该是f > -1e-7 && f < 1e-7,为什么呢? 浮点型,由于精度关系(float精度:2^23 = 8388608,一共7位,同理double 16位),最小分...
https://www.tsingfun.com/it/cp... 

浮点数在内存中的表示 - C/C++ - 清泛网移动版 - 专注C/C++及内核技术

...:大家面试的时候可能会经常遇到考察浮点数与零比较的问题,是简单的 f == 0 吗?当然不是,正确的写法应该是f > -1e-7 && f < 1e-7,为什么呢? 浮点型,由于精度关系(float精度:2^23 = 8388608,一共7位,同理double 16位),最小分...
https://www.tsingfun.com/it/cp... 

浮点数在内存中的表示 - C/C++ - 清泛网 - 专注C/C++及内核技术

...:大家面试的时候可能会经常遇到考察浮点数与零比较的问题,是简单的 f == 0 吗?当然不是,正确的写法应该是f > -1e-7 && f < 1e-7,为什么呢? 浮点型,由于精度关系(float精度:2^23 = 8388608,一共7位,同理double 16位),最小分...
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Disabling Strict Standards in PHP 5.4

...to this I was running my site on 5.3.8. Unfortunately, php 5.4 combines E_ALL and E_STRICT , which means that my previous setting for error_reporting does not work now. My previous value was E_ALL &amp; ~E_NOTICE &amp; ~E_STRICT Should I just enable values one at a time? ...
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Unexpected Caching of AJAX results in IE8

...reventing IE from caching the response. Note that if you have other Ajax calls going on where you do want caching, this will disable it for those too. In that case, switch to using the $.ajax() method and enable that option explicitly for the necessary requests. See http://docs.jquery.com/Ajax/jQu...
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Internal Error 500 Apache, but nothing in the logs?

... Please Note: The original poster was not specifically asking about PHP. All the php centric answers make large assumptions not relevant to the actual question. The default error log as opposed to the scripts error logs usually has the (more) specific error. often it will b...
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What is an ORM, how does it work, and how should I use one? [closed]

... case with a pseudo language: You have a book class, you want to retrieve all the books of which the author is "Linus". Manually, you would do something like that: book_list = new List(); sql = "SELECT book FROM library WHERE author = 'Linus'"; data = query(sql); // I over simplify ... while (row ...
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快速理解 高频对冲套利自动交易(程式化交易) - 更多技术 - 清泛网 - 专注...

...的都是浮亏的。直到浮亏变盈。) 你的理解大体上没有问题。与以往单向投机的区别是:我并非在某个价位上有多笔持仓浮亏,而是,每一个持仓浮亏单,均是不同价格,且由于是对冲套利持仓,不担心绝对价格的暴涨暴跌,...