计算机英语：程序设计语言

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1、计算机英语：程序设计语言ComputerHigh-LevelLanguageProgrammingLanguage　　Aprogramminglanguageisalanguageusedto%riteinstructionsforthecomputer.Thepurposeofaprogramminglanguageistoallowtheprogrammertoexpressdataprocessingactivitiesinasymbolicmanncrwithoutregardtothedetailsth

2、atthemachinehastoknow．Forexample,whenaprogrammerwritesULTIPLYHOURSTIMESRATE,thesewordsare-meaninglesstothemachine.MULTIPLYmustreedintoacodethatmeansmultiply.HOURSandL-ATEmustbeturnedintomemorylocationswhereoneitemsofdataareactuallylocated.Therammingstatements

3、thatarewrittenbytheprogrammerarecalledsourcelanguage,andtheyareturnedintothecomputer'smachinelanguagebytranslateprogramscalledassemblers，compilersandinterpreters．　　Programminglanguagesfallintotwomajorcategories：low-levelassemblylanguagesandhigh-levellanguages

4、．AssemblylanguagesareavailableforeveryCPUfamily,andtheytranslateonelineofcodeintoonemachinelanguageinstruction．High-levellanguagestranslateprogrammingstatementsintoseveralmachineinstructions．翻译：计算机高级语言程序设计语言　　程序设计语言是一种用于编写计算机指令的语言。程序设计语言的目的是让程序设计者在不考虑机器是否能识别细

5、节的情况下，以符号的方式表达对数据的处理活动。例如，当程序设计者写MultiplyHoursTimesRate，这些字对机器来说是毫无意义的，Multiply必须被转换成代表其意义的代码。Hours和Rate必须被变成存储单元，这些数据项应在其中。由程序设计者所写的程序设计语句叫做源语言，这些程序设计语句被称为叫做汇编程序、编泽程序、解释程序的翻译程序转换成计算机的机器语言。　　程序设计语言主要分成两类：低级汇编语言和高级语言。汇编语言用十每一个CPU家族。他们把一行代码转换成一个机器语言指令。高级语言把程序设计

6、语句转换成几个机器指令。WhatIsMeantbyHigh-levelLanguage'　　Ahigh-levellanguageisalanguage,whichisclosertonaturallanguage,ormathematicallanguagethanmachinecodeorassemblylanguage.Itisthereforefarlessmachinedependent,sothattheprogrammerneedsfarlessknowledgeofthedetailsofthem

7、icrocomputersystem.Itisalsomoreabstractinthatitisclosertotheconceptsoftheproblemthattheprogrammeristryingtosolve.Itisgenerally)moreconcise,inthatasinglestatementinthehigh-levellanguage(usuallyoccupyingonelineofsourcetext)oftencorrespondstomorethanoneassemblyl

8、anguagestatement(ormachineinstruction)．　　Ahigh-levellanguagemaybetranslatedbyacompilerviaoneormoreintermediatelanguagesintoassemblylanguageormachinecode．Alternativelyitmaybeinterpreteddir