callbyreferenceWord下载.docx

callbyreferenceWord下载.docx

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Clause3:

（that=tasks）youmightwantafunctiontoperform.

Analysis:

S+V:

Themechanismisnot

C:

Q:

E:

Themechanismisnotsufficient

Thecall-by-valuemechanismisnotsufficient

Thecall-by-valuemechanismisnotsufficientforalltasks

weused

that（=mechanism）weused

that（=mechanism）weuseduntilnow

youmightwant

youmightwantafunction

（that=tasks）youmightwantafunctiontoperform.

Finaltranslation:

TOP

Forexample,onecommontaskforafunctionistoobtainaninputvaluefromtheuserandsetthevalueofanargumentvariabletothisinputvalue.

onecommontaskis

onecommontaskforafunctionis

onecommontaskforafunctionistoobtainandset

onecommontaskforafunctionistoobtainaninputvalueandset

onecommontaskforafunctionistoobtainaninputvaluefromtheuserandset

onecommontaskforafunctionistoobtainaninputvaluefromtheuserandsetthevalueofanargumentvariable

onecommontaskforafunctionistoobtainaninputvaluefromtheuserandsetthevalueofanargumentvariabletothisinputvalue.

Forexample,onecommontaskforafunctionistoobtainaninputvaluefromtheuserandsetthevalueofanargumentvariabletothisinputvalue.

Withthecall-by-valueformalparametersthatwehaveuseduntilnow,acorrespondingargumentinafunctioncallcanbeavariable,butthefunctiontakesonlythevalueofthevariableanddoesnotchangethevariableinanyway.

Withthecall-by-valueformalparametersacorrespondingargumentinafunctioncallcanbeavariable,

that（=call-by-value_formal_parameters）wehaveuseduntilnow,

butthefunctiontakesonlythevalueofthevariableanddoesnotchangethevariableinanyway.

acorrespondingargumentcanbe

acorrespondingargumentcanbeavariable,

acorrespondingargumentinafunctioncallcanbeavariable,

Withthecall-by-valueformalparametersacorrespondingargumentinafunctioncallcanbeavariable,

wehaveused

that（=call-by-value_formal_parameters）wehaveused

that（=call-by-value_formal_parameters）wehaveuseduntilnow,

butthefunctiontakesanddoesnotchange

butthefunctiontakesonlythevalueanddoesnotchange

butthefunctiontakesonlythevalueofthevariableanddoesnotchange

butthefunctiontakesonlythevalueofthevariableanddoesnotchangethevariable

butthefunctiontakesonlythevalueofthevariableanddoesnotchangethevariableinanyway.

Withacall-by-valueformalparameteronlythevalueoftheargumentissubstitutedfortheformalparameter.

AissubstitutedforB的意思是A被用來取代B。

（主動語氣的說法是substituteAforB）

onlythevalueissubstituted

onlythevalueissubstitutedfortheformalparameter.

onlythevalueoftheargumentissubstitutedfortheformalparameter.

Withacall-by-valueformalparameteronlythevalueoftheargumentissubstitutedfortheformalparameter.

Foraninputfunction,youwantthevariable（notthevalueofthevariable）tobesubstitutedfortheformalparameter.

youwant

youwantthevariable

youwantthevariabletobesubstituted

youwantthevariabletobesubstitutedfortheformalparameter.

youwantthevariable（notthevalueofthevariable）tobesubstitutedfortheformalparameter.

Foraninputfunction,youwantthevariable（notthevalueofthevariable）tobesubstitutedfortheformalparameter.

Thecall-by-referencemechanismworksinjustthisway.

Themechanismworks

Thecall-by-referencemechanismworks

Thecall-by-referencemechanismworksinthisway.

Thecall-by-referencemechanismworksinjustthisway.

Withacall-by-referenceformalparameter,thecorrespondingargumentinafunctioncallmustbeavariable,andthisargumentvariableissubstitutedfortheformalparameter.

Withacall-by-referenceformalparameter,thecorrespondingargumentinafunctioncallmustbeavariable,

andthisargumentvariableissubstitutedfortheformalparameter.

thecorrespondingargumentmustbe

thecorrespondingargumentinafunctioncallmustbe

thecorrespondingargumentinafunctioncallmustbeavariable,

Withacall-by-referenceformalparameter,thecorrespondingargumentinafunctioncallmustbeavariable,

andthisargumentvariableissubstituted

andthisargumentvariableissubstitutedfortheformalparameter.

Itisalmostasiftheargumentvariablewereliterallycopiedintothebodyofthefunctiondefinitioninplaceoftheformalparameter.

Itisalmost（sth=as_if...）

asiftheargumentvariablewereliterallycopiedintothebodyofthefunctiondefinitioninplaceoftheformalparameter.

Itis

Itis（sth=as_if...）

asiftheargumentvariablewerecopied

asiftheargumentvariablewerecopiedintothebody

asiftheargumentvariablewerecopiedintothebodyofthefunctiondefinition

asiftheargumentvariablewerecopiedintothebodyofthefunctiondefinitioninplaceoftheformalparameter.

asiftheargumentvariablewereliterallycopiedintothebodyofthefunctiondefinitioninplaceoftheformalparameter.

Aftertheargumentissubstitutedin,thecodeinthefunctionbodyisexecutedandcanchangethevalueoftheargumentvariable.

Aftertheargumentissubstitutedin,

thecodeinthefunctionbodyisexecutedandcanchangethevalueoftheargumentvariable.

Aftertheargumentissubstituted

Aftertheargumentissubstitutedin,

thecodeisexecutedandcanchange

thecodeinthefunctionbodyisexecutedandcanchange

thecodeinthefunctionbodyisexecutedandcanchangethevalue

thecodeinthefunctionbodyisexecutedandcanchangethevalueoftheargumentvariable.