下面哪种方式不能实现将字符串 "Happy Spring!" 输出重定向到文件 log.txt （ ）。
- A. 1 freopen("log.txt", "w", stdout); 2 cout << "Happy Spring!" << endl; 3 fclose(stdout);
- B. 1 std::ofstream outFile("log.txt"); 2 outFile << "Happy Spring!" << endl; 3 outFile.close();
- C. 1 std::ofstream outFile("log.txt"); 2 cout << "Happy Spring!" << endl; 3 outFile.close();
- D. 1 ofstream log_file("log.txt"); 2 streambuf* org_cout = cout.rdbuf(); 3 cout.rdbuf(log_file.rdbuf()); 4 cout << "Happy Spring!" << endl; 5 cout.rdbuf(org_cout);
正确答案：C