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fi fail( ) ; fi bad( ) ; fi good( ) ; fi eof( ) ;
ifstream *pFile=new ifstream("c://ctest//test.txt"); ifstream file("c://ctest//test.txt"); ifstream file;file.open("c://ctest//test.txt"); ifstream file("c:/etest/test.txt");
fifail( ); fibad( ); figood( ); fieof( );
fifail() ; fibad() ; fin,good() ; fieof();
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" ) ;
fifail( ): fibad( ); figood( ); fieof( );
ifstream fin=ifstream.open(“file.dat”); ifstream*fir=new ifstream(“file.dat”); ifstream fin;fin.open(“file.dat”); ifstream*fin=new ifstream( );fin->open(“file.dat”);
fin.fail( ); fin.bad( ); fin.good( ); fin.eof( );
class private extends public
fin.fail() ; fin.bad() ; fin,good() ; fin.eof();
ifstream fin;fin.open("C:////test.txt"); ifstream fin("C:////test.txt"); A)和B) ifstream fin;fin("C:////test.txt");
ifstream *pFile=new ifstream("c://ctest//test.txt"); ifstream file("c://ctest//test.txt"); ifstream file;file.open("c://ctest//test.txt"); ifstream file("c:/etest/test.txt");
fin.fail( ); fin.bad( ); fin.good( ); fin.eof( );
cin istream ifstream istrtream