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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");
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ifstream fin=ifstreaopen("fildat"); ifstream*fin=new ifstream("fildat"): ifstream fin;fiopen("fildat"); ifstream*fin=new ifstream( );fin->open("fildat");
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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");