大约有 37,000 项符合查询结果(耗时:0.0326秒) [XML]

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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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What is the best regular expression to check if a string is a valid URL?

...EFFFD}!\$&amp;'\(\)\*\+,;=:@])|[\/\?])*)?)$/i How they were compiled (in PHP): &lt;?php /* Regex convenience functions (character class, non-capturing group) */ function cc($str, $suffix = '', $negate = false) { return '[' . ($negate ? '^' : '') . $str . ']' . $suffix; } function ncg($str, $...
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Facebook Open Graph not clearing cache

...ER['HTTP_HOST'].'/'.$user_photo; &lt;meta property="og:url" content="&lt;?php echo $url; ?&gt;"/&gt; &lt;meta property="og:image" content="&lt;?php echo $user_photo; ?&gt;" Just add this to your page: // with jQuery $.post( 'https://graph.facebook.com', { id: '&lt;?php echo $url;...
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Can anyone explain what JSONP is, in layman terms? [duplicate]

...p; xhr.status == 200) { // success }; }; xhr.open("GET", "somewhere.php", true); xhr.send(); JSONP Request: var tag = document.createElement("script"); tag.src = 'somewhere_else.php?callback=foo'; document.getElementsByTagName("head")[0].appendChild(tag); The difference between a JSON...
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Difference between \w and \b regular expression meta characters

...javascriptkit.com/javatutors/redev2.shtml http://www.virtuosimedia.com/dev/php/37-tested-php-perl-and-javascript-regular-expressions http://www.i-programmer.info/programming/javascript/4862-master-javascript-regular-expressions.html I found this to be a very useful book: Mastering Regular Expres...
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https connection using CURL from command line

...e call to allow insecure connections. curl -k https://whatever.com/script.php Edit: I discovered the root of the problem. I was using an SSL certificate (from StartSSL, but I don't think that matters much) and hadn't set up the intermediate certificate properly. If you're having the same problem ...