/*Time: 2017-02-22 11:11:15Describe: C++程序将标准输入/输出重定向为文件输入/输出。
*/#include <iostream>
#include <fstream>
#include <string>using namespace std;void f()
{string line;while(getline(cin, line))  //input from the file in.txt{cout << line <<endl;   //output to the file out.txt}
}// TEST ONE.
int main()
{ifstream in("in.txt");streambuf *backinbuf = cin.rdbuf(); //save old bufcin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt!ofstream out("out.txt");streambuf *backoutbuf = cout.rdbuf(); //save old bufcout.rdbuf(out.rdbuf()); //redirect std::cout to out.txt!// ONE.f(); //call function
}// TEST TWO.
/*
int main()
{ifstream in("in.txt");streambuf *backinbuf = cin.rdbuf(); //save old bufcin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt!ofstream out("out.txt");streambuf *backoutbuf = cout.rdbuf(); //save old bufcout.rdbuf(out.rdbuf()); //redirect std::cout to out.txt!// TWO.string word;cin >> word;           //input from the file in.txtcout << word << "--";  //output to the file out.txt
}
*/// TEST THREE.
/*
int main()
{ifstream in("in.txt");streambuf * backinbuf = cin.rdbuf(); //save old bufcin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt!ofstream out("out.txt");streambuf * backoutbuf = cout.rdbuf(); //save old bufcout.rdbuf(out.rdbuf()); //redirect std::cout to out.txt!// DO SOMETHING...... (redirect.)// RESET.cin.rdbuf(backinbuf);   //reset to standard input againcout.rdbuf(backoutbuf); //reset to standard output again// THREE.cin >> word;   //input from the standard inputcout << word;  //output to the standard input
}
*/