{"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":73,"pdf_page":89,"physical_index":89,"physical_index_base":0,"printed_page_status":"recognized","page_sha256":"4ffff38f91905f92ef91583b23160692ecdcb587828c15640071d01a181a07b3"},"chapter":"编码隐匿在计算机软硬件背后的语言","content":"“听，我的孩子，你们很快就能听到保罗·里威尔（PaulRevere）午夜的马蹄声。”享利·沃兹沃思·朗福罗（Henry Wadsworth Longfellow）写到。尽管他在描述保罗·里威尔是如何通知美国人英国殖民者入侵的消息时不一定与史实完全一致，然而他确实提供了一个耐人寻味的利用二进制传递重要信息的例子：\n\n他对他的朋友说：“今晚如果从镇里来的英国军队通过海路或陆路入侵，你就在北教堂钟楼的拱门处高高挂起提灯作为特殊信号一盏提灯表示从英军从陆路进军，两盏则表示英军从海路入侵…”\n\n总结起来就是说，保罗·里威尔的朋友有两盏提灯。如果英国军队从陆路进犯，他会在教堂钟楼上挂起一盏提灯。如果英国从海路进军，他会将两盏提灯都在教堂钟楼上挂起。\n\n然而，朗福罗并没有明确地提到所有的可能性。他留下了第三种可能的情况没有说，那就是英军根本没有入侵。朗福罗已经暗示，如果是这样的话可以通过不在教堂钟楼上挂提灯来表示。\n\n假设两盏提灯实际上是永久固定在教堂钟楼上的。通常它们不会被点亮。\n\n这代表英军还没有入侵。如果一盏提灯亮起：\n\n或\n\n9 二进制数\n\n73","previous_page":72,"next_page":74}