{"resolved":true,"match_type":"uuid","source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","requested_by":"printed_page","book":{"source_type":"original_book","book_id":"38270854-596f-4a26-8183-db8c968c6020","id":"38270854-596f-4a26-8183-db8c968c6020","uuid":"38270854-596f-4a26-8183-db8c968c6020","title":"编码 隐匿在计算机软硬件背后的语言","normalized_title":"编码隐匿在计算机软硬件背后的语言","author":null,"edition":null,"publisher":null,"year":null,"isbn":"9787121181184","isbns":["9787121181184","0123456789","6044921875","3039331000","0000000000","0000000000000"],"parsed":true,"ai_readable":true,"document_type":"book","page_count":438,"navigation_url":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020","title_url":"https://workshop.closeclaw.top/ai/title/%E7%BC%96%E7%A0%81%20%E9%9A%90%E5%8C%BF%E5%9C%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E8%BD%AF%E7%A1%AC%E4%BB%B6%E8%83%8C%E5%90%8E%E7%9A%84%E8%AF%AD%E8%A8%80","fixed_page_url_template":"https://workshop.closeclaw.top/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","path_api_url_template":"https://workshop.closeclaw.top/api/ai/book/38270854-596f-4a26-8183-db8c968c6020/page/{printed_page}","read_url":"https://workshop.closeclaw.top/api/ai/read/38270854-596f-4a26-8183-db8c968c6020","page_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/page","search_url":"https://workshop.closeclaw.top/api/ai/books/38270854-596f-4a26-8183-db8c968c6020/search"},"page":{"printed_page":190,"pdf_page":206,"physical_index":206,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"b7d5fb824e77ea61ff8ce5ed06c4492ee7c4672b47fa428fdc74aca2e0100966"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"字来计数。十六进制的计数过程将会是下面这种形式：\n\n0 1 2 3 4 5 6 7 8 9??????10 11 12...\n\n上图中10（准确地来说是一个1紧挨着一个0）这个数字代表的准确含义实际上应该是十进制中的16。图中的问号表明我们还需要6个符号来完整表示十六进制系统。这些符号究竟是什么？它们出于何处？仔细想想，原有的计数系统中的符号都有自己的唯一身份，所以应该而且必须引入新的符号。寻找6个新符号对我们来说是小菜一碟，例如下面这几个符号：\n\n不像我们所使用的大多数数字符号，上面列出的每个符号都很容易识记，而且其背后都隐含着实际数字意义，这种形象的符号使得它们便于记忆。比如这个10加仑的牛仔帽、一个橄榄球（11个人组成一支橄榄球队）、一打（12个）面包圈、一只黑猫（使人们想起不吉利的13）、一轮满月（一般出现在后弦月14天之后的夜晚)，一把匕首让人们联想到凯撒大帝（JuliusCaesar）在三月的月中（第15日）被刺杀。\n\n两个十六进制数可以完整地代表一个字节。这也意味着一个十六进制数恰好由4位二进制数组成，即半字节。下面这张表描述了如何在二进制、十六进制、十进制数之间进行转换。\n\n编码—隐匿在计算机软硬件背后的语言\n\n190","previous_page":189,"next_page":191}