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最新发表
AJAX解惑篇 (外文翻译作品,ajax解惑系列之一)
一个ajax的经典测试用例（时时都在为新手着想） [zt]
[转贴]web打印的另类方法
一些html页面展示的技巧
一些小程序---15位身份证号升级到18位的function
准备完善“桌面办公自动化系统(DOA)测试版发布(html+javascript) ”
关于java里的double判断
可以用这个方法来判断一个double是否是NaN
public boolean isNaN(double v) {
return (v != v);
}
如果在对这个数字就进行操作前不做这个判断，会导致很讨厌的错误。
偶是在一段程序中未做这个处理导致最后插入到数据库的时候出错。
看到NaN的问题，我也来谈一谈。
有关于详细的NaN的规范，可以参见 IEEE 754，浮点运算标准 。
在Java语言中，NaN是一个很特殊的值，通常是由于除零造成的。比如1.0/ 0.0或是0.0 / 0.0，这是两种不同的NaN，前面的一个称为Positive infinity，相应的也有Negative infinity。都是由于浮点运算的溢出造成的。
因此由于浮点运算的特殊性，NaN有一个特殊的性质，NaN != NaN，也就是在浮点预算时一个NaN不等于它自身。因此有了...
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GlallullY | 12/10/2009, 05:01
Cool funny anecdote:)
There was this guy see.
He wasn't very bright and he reached his adult life without ever having learned "the facts".
Somehow, it gets to be his wedding day.
While he is walking down the isle, his father tugs his sleeve and says,
"Son, when you get to the hotel room...Call me"
Hours later he gets to the hotel room with his beautiful blushing bride and he calls his father,
"Dad, we are the hotel, what do I do?"
"O.K. Son, listen up, take off your clothes and get in the bed, then she should take off her clothes and get in the bed, if not help her. Then either way, ah, call me"
A few moments later...
"Dad we took off our clothes and we are in the bed, what do I do?"
O.K. Son, listen up. Move real close to her and she should move real close to you, and then... Ah, call me."
A few moments later...
"DAD! WE TOOK OFF OUR CLOTHES, GOT IN THE BED AND MOVED REAL CLOSE, WHAT DO I DO???"
"O.K. Son, Listen up, this is the most important part. Stick the long part of your body into the place where she goes to the bathroom."
A few moments later...
"Dad, I've got my foot in the toilet, what do I do?"
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