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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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Rounding DateTime objects

... 130 Floor long ticks = date.Ticks / span.Ticks; return new DateTime( ticks * span.Ticks ); Round...
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Edit a commit message in SourceTree Windows (already pushed to remote)

... is not the most recent commit) using SourceTree for Windows version 1.5.2.0: Step 1 Select the commit immediately before the commit that you want to edit. For example, if I want to edit the commit with message "FOOBAR!" then I need to select the commit that comes right before it: Step 2 Right...
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Renaming table in rails

... | edited Apr 5 '16 at 18:02 vergenzt 7,38333 gold badges2424 silver badges4141 bronze badges answered J...
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“No X11 DISPLAY variable” - what does it mean?

... 10 Answers 10 Active ...
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How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?

...u need the equivalent trick with the stringizing operator too. Section 6.10.3 of the C99 standard covers 'macro replacement', and 6.10.3.1 covers 'argument substitution'. After the arguments for the invocation of a function-like macro have been identified, argument substitution takes place. A...
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codestyle; put javadoc before or after annotation?

... edited Sep 27 '13 at 4:37 n00begon 3,43033 gold badges2525 silver badges4141 bronze badges answered Jun 24 '10 at 12:37 ...