Buffer and Buffer-handling.txt

//USING BUFFER TO GIVE OUTPUT TO A FILE.
#include<iostream>
#inlcude<fstream>
using namespace std;

int main()
{
    fstream file;
    file.open("cout.txt", ios::out);
    string line;
 
    // Backup streambuffers of  cout
    streambuf* stream_buffer_cout = cout.rdbuf();
    streambuf* stream_buffer_cin = cin.rdbuf();
 
    // Get the streambuffer of the file
    streambuf* stream_buffer_file = file.rdbuf();
 
    // Redirect cout to file
    cout.rdbuf(stream_buffer_file);
 
    cout << "This line written to file" << endl;
 
    // Redirect cout back to screen
    cout.rdbuf(stream_buffer_cout);
    cout << "This line is written to screen" << endl;
 
    file.close();
    return 0;
}



HoW TO CLEAR BUFFER:
While taking multiple input consecutively, error occurs due to remaining buffer which can be resolved by the following 
techni1que

1) using "cin.ignore(numeric_limits<streamsize>::max(),'\n');" after the first input.
    Note: #include<ios> for streamsize and #include<limits> for numeric limits must be included.

2) using "cin.sync();" after the first input.

3) using "cin>>ws;" after the first input.