小杨用文件重定向实现在 log.txt 文件中输出日志，则下面横线上应填写（ ）。
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main() {
ofstream log_file("log.txt");
streambuf* original_cout = cout.rdbuf();
cout.rdbuf(log_file.rdbuf());
___________________________________ // 在此处填入代码
cout.rdbuf(original_cout); // 恢复原始的标准输出缓冲区
return 0;
}
- A. cout << "This output will go to the log file." << endl;
- B. log_file << "This output will go to the log file." << endl;
- C. cout >> "This output will go to the log file." >> endl;
- D. log_file >> "This output will go to the log file." >> endl;
正确答案：A