?? rw1.cpp
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/* The following code example is taken from the book * "The C++ Standard Library - A Tutorial and Reference" * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#include <iostream>#include <fstream>using namespace std;int main(){ // open file ``example.dat'' for reading and writing filebuf buffer; ostream output(&buffer); istream input(&buffer); buffer.open ("example.dat", ios::in | ios::out | ios::trunc); for (int i=1; i<=4; i++) { // write one line output << i << ". line" << endl; // print all file contents input.seekg(0); // seek to the beginning char c; while (input.get(c)) { cout.put(c); } cout << endl; input.clear(); // clear eofbit and failbit }}
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