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1、functionprintfintprintf(constfmat...)PrintfmatteddatatostdoutWritestothestardoutput(stdout)asequenceofdatafmattedasthefmatargumentspecifies.Afterthefmatparameterthefunctionexpectsatleastasmanyadditionalargumentsasspecifi
2、edinfmat.ParametersfmatStringthatcontainsthetexttobewrittentostdout.Itcanoptionallycontainembeddedfmattagsthataresubstitutedbythevaluesspecifiedinsubsequentargument(s)fmattedasrequested.Thenumberofargumentsfollowingthefm
3、atparametersshouldatleastbeasmuchasthenumberoffmattags.Thefmattagsfollowthisprototype:%[flags][width][.precision][length]specifierWherespecifieristhemostsignificantonedefinesthetypetheinterpretationofthevalueofthecespond
4、ingargument:specifierOutputExamplecacteradiSigneddecimalinteger392eScientificnotation(mantissaexponent)usingeacter3.9265e2EScientificnotation(mantissaexponent)usingEacter3.9265E2fDecimalfloatingpoint392.65gUsetheshterof%
5、e%f392.65GUsetheshterof%E%f392.65oUnsignedoctal610sStringofacterssampleuUnsigneddecimalinteger7235xUnsignedhexadecimalinteger7faXUnsignedhexadecimalinteger(capitalletters)7FApPointeraddressB800:0000nNothingprinted.Thearg
6、umentmustbeapointertoasignedintwherethenumberofacterswrittensofarissted..Theprecisionisnotspecifiedinthefmatstringbutasanadditionalintegervalueargumentprecedingtheargumentthathastobefmatted.lengthdeionhTheargumentisinter
7、pretedasashtintunsignedshtint(onlyappliestointegerspecifiers:idouxX).lTheargumentisinterpretedasalongintunsignedlongintfintegerspecifiers(idouxX)asawideacterwideacterstringfspecifierscs.LTheargumentisinterpretedasalongdo
8、uble(onlyappliestofloatingpointspecifiers:eEfgG).additionalargumentsDependingonthefmatstringthefunctionmayexpectasequenceofadditionalargumentseachcontainingonevaluetobeedinsteadofeach%tagspecifiedinthefmatparameterifany.
9、Thereshouldbethesamenumberoftheseargumentsasthenumberof%tagsthatexpectavalue.ReturnValueOnsuccessthetotalnumberofacterswrittenisreturned.Onfailureanegativenumberisreturned.Example123456789101112printfexample#includeintma
10、in()printf(“acters:%c%cn“a65)printf(“Decimals:%d%ldn“1977650000L)printf(“Precedingwithblanks:%10dn“1977)printf(“Precedingwithzeros:%010dn“1977)printf(“Somedifferentradixes:%d%x%o%#x%#on“100100100100100)printf(“floats:%4.
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