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ifstream fin；fin．open("C:////test．txt")； ifstream fin("C:////test．txt")； （A和B) ifstream fin；fin("C:////test．txt")；
when, if whether, whether if, whether whether, if
whether he is at home if he is at home that he is at home whether is he at home
whether will he come if he has come whether he will come that he will come
fin．fail( )； fin．bad( )； fin．good( )； fin．eof( )；
ifstream fin = ifstream, open( "file. dat" ) ; ifstream * fin = new ifstream( "file. dat" ) ; ifstream fin; fin. open ( "file. dat" ) ; ifstream * fin = new ifstream() ; fin -＞ open( "file. dat" ) ;
whether he will whether will he that he will that will he
if; If whether; Whether whether; If if; Whether
that ; that that ; whether if ; whether whether ; whether
fin．fail() ； fin．bad() ； fin，good() ； fin．eof()；
whether; that that; whether that; that whether; whether
fin. fail( ) ; fin. bad( ) ; fin. good( ) ; fin. eof( ) ;
whether can he finish whether he could finish whether can how finish whether he can finish
whether, That, when that, What, whether whether, What, whether that, Why, whether
whether he will whether will he that he will that will he
fin．fail( )； fin．bad( )； fin．good( )； fin．eof( )；
that ; that that ; whether if ; whether whether ; whether
if; Whether whether; Whether /; If whether; If
if; whether whether; whether whether; if if ; /
ifstream fin；fin．open("C:////test．txt")； ifstream fin("C:////test．txt")； A)和B) ifstream fin；fin("C:////test．txt")；
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