Display a file backwards on the screen: seekg(0, ios::end),tellg()

  

#include <iostream>
#include <fstream>
using namespace std;

int main(int argc, char *argv[])
{
  if(argc!=2) {
    cout << "usage: REVERSE <filename>\n";
    return 1;
  }

  ifstream in(argv[1], ios::in | ios::binary);

  if(!in) {
    cout << "Cannot open input file.\n";
    return 1;
  }

  char ch;
  long i;

  // go to end of file (less eof char)
  in.seekg(0, ios::end);
  i = (long) in.tellg(); // see how many bytes in file
  i -= 2;                // backup before eof

  for( ;i>=0; i--) {
    in.seekg(i, ios::beg);
    in.get(ch);
    cout << ch;
  }

  in.close();

  return 0;
}

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Display a file backwards on the screen: seekg(0, ios::end),tellg() : ifstream « File « C++

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