程式設計講義----PGM10-05.cpp

[Kenad (..大拇指腫歪歪..)]

#include <fstream.h>
#include <stdlib.h>

const int MAXLENGTH = 31;

char filename[MAXLENGTH] = "test.dat";

int main()
{
  char ch;
  long offset, last;

  ifstream in_file(filename);

  if (in_file.fail())   // check for successful open
  {
    cout << "\nThe file was not successfully opened"
      << "\n Please check that the file currently exists"
      << endl;
    exit(1);
  }

  in_file.seekg(0L,ios::end);   // move to the end of the file
  last = in_file.tellg();       // save the offset of the last character

  for(offset = 1L; offset <= last; offset++)
  {
    in_file.seekg(-offset, ios::end);
    ch = in_file.get();
    cout << ch << " : ";
  }

  in_file.close();

  return 0;
}

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