(1)程序的开发效率低下;(2)程序的可重用性差;(3)程序的维护成本高;(4)无法适应信息的快速膨胀和多样化。
A.ifstreamB.ofstreamC.fstreamD.ios
A.ifstream file(“d:\kaoshi\test.txt”);B.ifstream file(“d:\\kaoshi\\test.txt”);C.ifstream file;file.open(“d:\\kaoshi\\test.txt”);D.ifstream *pFile=new ifstream(“d:\\kaoshi\\test.txt”);