/*
Time: 2017-02-22 11:11:15
Describe: 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 buf
cin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt! ofstream out("out.txt");
streambuf *backoutbuf = cout.rdbuf(); //save old buf
cout.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 buf
cin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt! ofstream out("out.txt");
streambuf *backoutbuf = cout.rdbuf(); //save old buf
cout.rdbuf(out.rdbuf()); //redirect std::cout to out.txt! // TWO.
string word;
cin >> word; //input from the file in.txt
cout << word << "--"; //output to the file out.txt
}
*/ // TEST THREE.
/*
int main()
{
ifstream in("in.txt");
streambuf * backinbuf = cin.rdbuf(); //save old buf
cin.rdbuf(in.rdbuf()); //redirect std::cin to in.txt! ofstream out("out.txt");
streambuf * backoutbuf = cout.rdbuf(); //save old buf
cout.rdbuf(out.rdbuf()); //redirect std::cout to out.txt! // DO SOMETHING...... (redirect.) // RESET.
cin.rdbuf(backinbuf); //reset to standard input again
cout.rdbuf(backoutbuf); //reset to standard output again // THREE.
cin >> word; //input from the standard input
cout << word; //output to the standard input
}
*/