Remove the repeated line in the file
In fact, it is a very simple operation, which is written here because it is recently seen in Thinking In C Volume 2 about iostream chapters, as exercises, so write it out. J
Define constants first
Const int unique_lines_ok = 0;
Const int unique_lines_error = 1;
Const int file_open_error = 2;
The following functions INT ULISF (Const String & Strfilename) use the functions used, where
Parameters const string & string & string & string is the name of the file;
return value
Unique_lines_ok: Deleting the duplicate row execution is successful;
Unique_lines_ERROR: Write file error;
File_Open_ERROR: The file is open failed.
The function is as follows:
INT ULISF (Const String & Strfilename)
{
INT IRET = UNIQUE_LINES_OK;
Set
String strreadline; // Temporary String Read from the file
// read each line from the file - begin -
ifstream fin (Strfilename.c_STR ()); // Read The File
IF (! fin) // Verify Open
{
IRET = file_open_error;
Return IRet;
}
While (getLine (Fin, Strreadline)
{
Setstrlines.insert (strreadline);
}
Fin.close ();
// r r - END - END -
// delete the file
REMOVE (Strfilename.c_str ());
// Write the strings of the set into the file - begin -
OFSTREAM Fout (Strfilename.c_str ()); // Write the file
IF (! fout) // Verify Open
{
IRET = file_open_error;
Return IRet;
}
Set
For (it = setstrlines.begin (); it! = setstrlines.end (); it )
{
Fout << IT-> c_str () << endl;
}
Fout.close ();
// Write the strings of the set inTo the file - end -
Return IRet;
}
Due to the file in the C standard library, you need to add header files
#include
#include
#include
#include
#include
(Finish)
