作者：stanleyjie
入手理由
首先是利益相关跟感谢，这把Double Shell F96 三模无线键盘得自于外设天下论坛去年12月的活动，官方售价799元，价格不菲。当下一把流行的键盘，大家能想到的无非就是功能上的热拔插、有线&蓝牙&无线2.4G三模连接、RGB背光、支持win&mac双系统；外观上的主题外观、98等紧凑配列等，但在键盘越来越同质化的当下，你有他有大家有，别人卖599,499，甚至399，Double Shell F96凭什么卖799？下面就到手体会跟大家随便聊聊。
远看外观
键盘刚拿出来时，并没有给我特别大的震撼感。主要是我这个人被现在各种主题方案图案惯坏的眼睛，一时还适应不了这种表面上的朴实无华。
96%的紧凑布局，换成在一年前，绝对也是吸睛的存在，不过对于我来说，却已经是习以为常。
但是细看之下，键盘还是有几个令我惊喜的地方
键帽
键盘刚拿出来时看上去黑乎乎，细看键帽却不是常规的PBT键帽，而是一套比较另类的键帽---高透PC茶色键帽。
这种全透键帽我在很早前刚接触机械键盘时曾收集过一套，这么多年来好像并没有在市面上流行开，直到去年才渐渐在某些成品键盘上看到。我之前那个键帽是无色全透明，不像这套是茶色透明，再加上用料更好的关系，眼前这套更加有高级感。
键帽上的撞色橙红色字体，能让用户看得更清。
键帽正面有略微下凹，便于指肚更好的贴合。
茶色的PC材质，让键帽虽然是全透，但是增加了一丝朦胧感。侧面看可以直接看到轴体。
透光键帽对键盘的背光来说是最大的加成，为此，键帽背面的加强筋也都去掉了。
夜间环境妥妥的就是光污染。
侧面近看，葡萄美酒夜光杯，键帽甚至有种琥珀的质感。
炭纤维纹路面板
这是键盘外观上的又一大亮点。以往外设爱好者改造键盘的时候，有种流行方案就是把键盘贴上炭纤维贴纸，类似汽车的美容装饰，而Double Shell F96 直接把键盘上盖面板喷绘成亮面炭纤维纹路。
外观讲完谈使用
96布局
键盘共有99个按键，是现在流行的96%紧凑布局，好处就是键盘在尽量保留大部分使用按键的情况下，又不会过多的占用桌面空间。不同于104/87的标准，市面上的96%布局键盘，多少会有点小改动，而Double Shell F96则比较靠近大部分的主流96%，用惯这类布局的玩家可以直接上手，而87/104的用户则需要适应一下。
对我来说，适应点主要在DEL按键的位置。
还有空格右侧的Alt、Fn 、Ctrl，三个按键的宽度变小，盲打时容易按错。而至于更深远的换键帽则不用担心，现在许多第三方键帽都有带这些增补按键。
对其他用户来说，最上面一排按键的间距估计也要适应一下。
热拔插轴体
键盘自带佳达隆茶轴，支持热拔插，这个没什么好多说，当下主流。轴板顺应时代，兼容三脚轴和五脚轴。
三模功能
键盘支持有线、2.4g无线、蓝牙三种模式。适用范围很广，台式电脑、笔记本、平板、甚至还能连接手机。
键盘内置1000mAh锂电池，相比我之前用过的无线键盘，这个容量不算大，我有用过内置1000mAh的。就目前使用来说，关起背光的情况下，用个一两个月应该没问题。外设天下的说法是最长可提供约45周的续航，那这个就有点夸张了，可能是厂家用了比较出色的节能方案吧。
键盘的开关位于背后，使用上有点不便。
三种模式之间的切换通过Fn加数字1到5，键帽上清晰的标注出来。
键盘背后的“快速操作指南”我觉得挺好，特别适合我这种键盘较多的人。
还有这个刻度尺，设计得很有创意。
双系统
系统支持win&mac双系统。通过Fn加A，进入到苹果系统模式；Fn加M进入win模式。配件中还有独立的键帽可供替换。
绚丽的RGB背光
键盘的RGB背光和多种背光方案，对我来说真的看腻了，这个就直接上图吧。
丰富。。。恩。。。且不寻常的配件
键盘配件不少，双头拔键器、替换键帽、接收器、连接线及转接头
连接线用的是双头type C口，再根据要连接的设备选择转接头
重要但缺失的公仔
官方的宣传图上，配件中还有赠送趣味公仔，用户可以自己diy创意3d键帽，我觉得这个是键盘最吸引我的地方。结果可能是因为评测品的原因，我收到的键盘并没有这些东西，大大的减分，少了最大附加值跟灵魂，少了跟其他键盘最大的不同。
品牌
背后铭牌标识是“达克甲板”，没错，正是很早前我所知道的deck的达克甲板，现在改叫double shell。
一些零零散散的感触跟建议
1.炭纤维纹路面板不要做亮面，缺少了一种深层次的质感。
2.键帽采用PC材质导致手感欠佳，手上有种滑滑的油腻感，还是不如pbt带来的手感好。
3.键盘的驱动在网上不大容易找。
4.配件中少了键盘防尘罩
5.键盘没有带收纳仓
剩下的键盘赏析
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篇四十：Double Shell F96 三模无线键盘
巢耿兴4577float和double类型的大小为 -
严竿独19821448838 ______ float:浮点型数据类型,FLOAT 数据类型用于存储单精度浮点数或双精度浮点数.此表示形式为 float 类型提供了一个大约在 -3.4E+38 和 3.4E+38 之间的范围. double(双精度浮点型)是计算机使用的一种资料型别.它可以表示十进制的15或...
巢耿兴4577C语言问题, f,lf,8.4lf区别,输出格式 看图,指导下为什么这么输出. -
严竿独19821448838 ______ %f格式,默认有6位小数,但是float类型最多只能保存6-7位有效数字,如果超出此范围,则多余的数字没有意义.float类型占用4个字节. %lf格式,用来输出double型数据,默认有6位小数,最多能保存15-16位位有效数字.double型占用8个字节. %8.4lf,输出总宽度至少8位,不足时,前面补空格;固定输出4位小数,小数不足4位时后面补0,超过4位时四舍五入.如果小数4位+小数点1位+整数位数的结果超出8位时,按实际宽度输出.
巢耿兴4577浮点型数据的运算误差 -
严竿独19821448838 ______ 首先,看一下浮点数误差原因 浮点数的误差的产生一般由于两个原因 1)由于计算机内部以二进制保存,所以十进制的有限位的小数,在计算机内部会是一个无限位的小数. 例如 十进制的0.9虽然只有一位小数,转成2进制是无限循环小数0....
巢耿兴4577请问:c语言中:若X为double型变量,请写出X=3.2运算,++X是(),变量X的值是()? -
严竿独19821448838 ______ x=3.2 则++x是对整数部分的自增,所以++x是4.2,,,然后自增后数保留.原来的x就变成4.2... 其实++x可以看成是x=x+1..这样就容易理解了吧!把原先自己的数加一再赋值给自己
巢耿兴4577C语言二进制浮点数储存方式 -
严竿独19821448838 ______ float 单精度说明符,在Turbo C中单精度型占4个字节(32位)内存空间,其数值范围为3.4E-38~3.4E+38,只能提供七位有效数字. double 双精度说明符.双精度型占8 个字节(64位)内存空间,其数值范围为1.7E-308~1.7E+308,可提供16...
巢耿兴4577c语言中double是双精度的,有效数字是15到16位为什么下面的运算结果是6位? -
严竿独19821448838 ______ 你是不是把有效数位、整数有效数位、小数有效数位都混淆到一起了? 无论是float型,还是double型,小数位最多都是6位 你所说的double型是15、16位,float型是7位,是整数位. 而两者的和,就是数的有效数位.
巢耿兴4577Java 中的有效数字
严竿独19821448838 ______ float a = 2.2242342424242424242424 超出float的最多小数点了吧就算没超过2.2242342424242424242424这个数是个double类型的啊! float a = 2.24f; //这样才是float 搞了半天你就是没搞懂java里面出现的小数点数字都是 default double,而不...
巢耿兴4577c语言有3位小数的浮点型数字输出后怎么最后一位会多出一个1? -
严竿独19821448838 ______ 浮点数在存储的时候 是近似值 所以 在打印的时候多一点 少一点 都是正常的 于是 在编程的时候,一般不会用%f 而是取一定位数,比如 %.3f 保留三位小数. 如果你要要求前六位都是完全精确的值,那么可以使用double 注意 输出的时候用%lf
巢耿兴4577实型数据存储时为什么会有误差? -
严竿独19821448838 ______ 肯定会有误差的 仪器误差或是线路误差都会导致数据有偏差
巢耿兴4577定义一个浮点型常量的时候为什么要在最后加上F -
严竿独19821448838 ______ 常量后面加F表示是float型,不加F的,整数默认为int型,浮点数默认为double型. pi是float型的变量,3.14为了和它匹配,所以就加上了F,否则需要这样一个强制类型转化 const float pi = (float)3.14; 缺少了在比较严格编译器中会提示一个warning的. 不是说过了嘛,3.14是double的,你把一个double类型的量赋值给float类型的就会有warning. const int a = 5.3; 上面这个会出问题你能理解吗,你这个是同样的道理. 没有写成double可能是不需要那么高的精度,double的运算比float慢很多.