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计算机网络(第4版)习题答案(中文版)
计算机网络 中文版 第四版 课后习题答案
第 1 章 概述
1. 答:狗能携带21千兆字节或者168千兆位的数据。18 公里/小时的速度等于0.005 公里/秒,走过x公里的时间为x / 0.005 = 200x秒, 产生的数据传输速度为168/200x Gbps或者840 /x Mbps。因此,与通信线路相比较,若x<5.6 公里,狗有更高的速度。
2. 使用局域网模型可以容易地增加节点。如果局域网只是一条长的电缆,且不会因个别的失效而崩溃( 例如采用镜像服务器)的情况下,使用局域网模型会更便宜。使用局域网可提供更多的计算能力和更好交互式接口。
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2010-04-20
lexyacc压缩手册
Contents
Contents.........................................................................................................................................2
Preface...........................................................................................................................................3
Introduction.....................................................................................................................................4
Lex..................................................................................................................................................6
Theory.........................................................................................................................................6
Practice.......................................................................................................................................7
Yacc..............................................................................................................................................12
Theory.......................................................................................................................................12
Practice, Part I............................................................................................................................13
Practice, Part II...........................................................................................................................16
Calculator......................................................................................................................................19
Description................................................................................................................................19
Include File................................................................................................................................22
Lex Input...................................................................................................................................23
Yacc Input.................................................................................................................................24
Interpreter..................................................................................................................................27
Compiler....................................................................................................................................28
Graph........................................................................................................................................30
More Lex.......................................................................................................................................34
Strings.......................................................................................................................................34
Reserved Words........................................................................................................................35
Debugging Lex...........................................................................................................................35
More Yacc.....................................................................................................................................36
Recursion..................................................................................................................................36
If-Else Ambiguity.......................................................................................................................36
Error Messages.........................................................................................................................37
Inherited Attributes.....................................................................................................................38
Embedded Actions.....................................................................................................................38
Debugging Yacc.........................................................................................................................39
Bibliography..................................................................................................................................40
2010-04-14
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