这部分讲解的内容主要是理解C语言中 —— 原码、反码、补码 在明白原码、反码、补码之前大家要明白这些概念只针对 整数,也就是说浮点数家族(float 和 double)在内存中的存储不是用原反补码这一套规律来存储的。 1. 一个变量的创建时要在内存中开辟空间的,空间的大小时根据不同的类型决定的。这时候,就涉及到了 ”C语言
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External Storage外部存储空间 外部存储空间是指手机出厂的时候不存在,用户在使用时候可以自由添加的外部存储介质比如TS卡,SD卡等闪存储介质。 因为是外部存储,访问时需要加权限。 在mainfest的package下面增加外部存储读写允许的权限。 <!-- 写入外部存储读写权限--> ...
是一个文件。storage/emulated/0/其实是你的SD卡路径,里面的内容也就是卡上的内容,该路径只是个挂载点 。应该在手机的download文件里面。 一个符号链接是包含在绝对或相对路径的形式的另一文件或目录的引用,并影响路径名解析任何文件的术语。到1978年,DEC和Data General的RDOS的微型计算机操作系统中已经存在符号链接...
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