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#include <string>
#include <iostream>
#include <istream>
#include "fdout.h"
using namespace std;
int main(int argc, char **argv)
{
OFdnStreambuf fds(STDOUT_FILENO, 500);
ostream os(&fds);
switch (argc)
{
case 1:
for (string s; getline(cin, s); )
os << s << '\n';
os << "COPIED cin LINE BY LINE\n";
break;
case 2:
cin >> os.rdbuf(); // Alternatively, use: cin >> &fds;
os << "COPIED cin BY EXTRACTING TO os.rdbuf()\n";
break;
case 3:
os << cin.rdbuf();
os << "COPIED cin BY INSERTING cin.rdbuf() into os\n";
break;
}
}
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