I/O Redirection

read_file.cpp

#include <iostream>
#include <fstream>
#include <string>

void readFile(){
    std::fstream file;
    file.open(R"(C:\Users\emrep\Documents\everyday\cpp\one_day\a.txt)", std::ios::out);
    std::string line;
    //std::cout << line << std::endl;
    std::streambuf* stream_buffer_cout = std::cout.rdbuf();
    std::streambuf* stream_buffer_cin = std::cin.rdbuf();

    std::streambuf* stream_buffer_file = file.rdbuf();

    std::cout.rdbuf(stream_buffer_file);
    std::cout<< "bu satir dosyaya yazildi" << std::endl;

    std::cout.rdbuf(stream_buffer_cout);
    std::cout<< "bu satir ekrana yazildi" << std::endl;

    file.close();
}

int main(){
    readFile();
    return 0;
}