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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...
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...
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"~"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...
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...
How do I resolve cherry-pick conflicts using their changes?
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201
First you should undo your cherry-pick, try to run this
git cherry-pick --abort
Second, try ...
How do I change the figure size with subplots?
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answered Feb 8 '13 at 10:48
Rutger KassiesRutger Kassies
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Python serialization - Why pickle?
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edited Jan 28 '14 at 23:06
answered Jan 23 '12 at 8:45
au...
PHP foreach change original array values
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270
In PHP, passing by reference (&) is ... controversial. I recommend not using it unless you k...
Eager load polymorphic
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209
My guess is that your models look like this:
class User < ActiveRecord::Base
has_many :re...
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...