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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

...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),最小分辨0.0000001, 当存储...
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

...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),最小分辨0.0000001, 当存储...
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Arduino控制RGB三色LED灯实验、程序代码、连线图、仿真 - 创客硬件开发 - ...

...控制,针对Arudino UNO板子中带有&quot;~&quot;的3、5、6、9、10、11数字端口写入一个模拟值,通知高电平与低电平持续时间的比值控制LED的亮度变化或者电机的转速。例如:欲使得内置的Arudino UNO 中的led亮度变为原来的一般,编写anal...
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位置传感器经纬度为0的问题 - 用户反馈 - 清泛IT社区,为创新赋能!

Pursuer丶: 想问下appinventor位置传感器调试一直是0,0是为什么 清泛: [图片] 清泛: 看看是不是权限问题 Pursuer丶: 是这样的 Pursuer丶: 他刚进来的时候是好的 然后跳到第二个屏幕 再返回第一个 就变0,0了 Pursuer丶: 一开...
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How do I resolve cherry-pick conflicts using their changes?

... 201 First you should undo your cherry-pick, try to run this git cherry-pick --abort Second, try ...
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How do I change the figure size with subplots?

... answered Feb 8 '13 at 10:48 Rutger KassiesRutger Kassies 41.9k1111 gold badges9090 silver badges9090 bronze badges ...
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Python serialization - Why pickle?

...| edited Jan 28 '14 at 23:06 answered Jan 23 '12 at 8:45 au...
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PHP foreach change original array values

... 270 In PHP, passing by reference (&amp;) is ... controversial. I recommend not using it unless you k...
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Eager load polymorphic

... 209 My guess is that your models look like this: class User &lt; ActiveRecord::Base has_many :re...
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What is the difference between exit() and abort()?

... objects though. So A a; void test() { static A b; A c; exit(0); } Will destruct a and b properly, but will not call destructors of c. abort() wouldn't call destructors of neither objects. As this is unfortunate, the C++ Standard describes an alternative mechanism which ensures prope...