fstream.cpp

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#include <fstream>    // for fstream
#include <iostream>   // for cout
#include <string>     // for string
 
#include <examples.h>
 
int main ( )
{
    // create a bi-directional fstream object
    std::fstream inout ("test_fstream.out",
                        std::ios::in | std::ios::out | std::ios::trunc);
 
    // write out three lines to the file
    inout << "Dieses ist die Geschichte eines Mannes.\n"
          << "C'est l'histoire d'un homme.\n"
          << "This is the story of a man.\n";
 
    std::string line;
 
    // seek to the beginning of the file
    inout.seekg (0);
 
    // extract the first line
    std::getline (inout, line);
 
    // output the first line to standard output
    std::cout << "\nDeutsch:\n" << line << '\n';
 
    // obtain current position in file
    const std::fstream::pos_type pos = inout.tellg ();
 
    // extract the second line
    std::getline (inout, line);
 
    // output the second line to standard output
    std::cout << "Francais:\n" << line << '\n';
 
    // extract the third line
    std::getline (inout, line);
 
    // output the third line to standard output
    std::cout << "English:\n" << line << '\n';
 
    // move the put sequence before the second line
    inout.seekp (pos);
 
    // replace the second and third lines
    inout << "This is the story of a man.\n"
          << "C'est l'histoire d'un homme.";
 
    // seek to the beginning of the file
    inout.seekg (0);
 
    // output the entire contents of the fstream object's buffer to stdout
    std::cout << "\n" << inout.rdbuf () << '\n';
 
    return 0;
}