problem in copying file

hurryo (4)
#include <iostream>
#include <fstream>

main()
{

ifstream a;
int z,n;
char ch;

a.open("dta.txt");
a.get(ch);
n=1;
while (!a.eof()){
while (!a.eof()&& (ch!='\n'))
{
cout << n << ch << endl;
n++;
a.get(ch);
}
}
a.close();
cin >> z;
}



this program is supposed to copy this file and display it on my monitor.Although it works but it displays it character by character i want to display it line by line.Help me pls!Thanks anyway
reactivo (7)
You could use:

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string str;
getline(a, str);

getline(a, str) will be sending each line that it reads from the a stream, to the str string variable.

Just a thought.
hurryo (4)
i need to announce 2 new libraries,one for string = <string>
and one for getline which i dont know,....
reactivo (7)
getline() is also defined in <string>.
hurryo (4)
it doesnt work thanks anyway
Duthomhas (13282)
How does it not work? The string getline() function is designed exactly to do what you want.
Here is a simple cat/more type program.
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#include <fstream>
#include <iostream>
#include <limits>
#include <sstream>
#include <string>
#include <vector>
using namespace std;

void pressenter( const string& prompt )
  {
  cout << prompt;
  cin.ignore( numeric_limits <streamsize> ::max(), '\n' );
  }

int main( int argc, char** argv )
  {
  vector <string> args( argv, argv +argc );

  if (args.size() < 2)
    {
    cout << "usage:\n  "
         << args[ 0 ] << " [LINES] FILENAME ...\n\n"
         << "where LINES defaults to 24 lines per screenful\n"
         << "specify 0 lines to display the entire file without pause\n";
    return 0;
    }

  // Get the maximum number of lines to display on the screen at once
  unsigned lines_per_screen = 24;
  if (stringstream( args[ 1 ] ) >> lines_per_screen)
    args.erase( args.begin() +1 );
  if (lines_per_screen == 0) lines_per_screen--;

  // For each filename listed...
  for (vector <string> ::const_iterator
       arg  = args.begin() +1;
       arg != args.end();
       arg++
    ) {
    ifstream f( arg->c_str() );
    if (!f)
      {
      cerr << "Could not open file \"" << *arg << "\"\n";
      continue;
      }
    // Display the lines of the file, lines_per_screen at a time
    unsigned line_number = 0;
    string   line;
    while (getline( f, line ))
      {
      if (line_number++ == lines_per_screen)
        {
        pressenter( "Press ENTER to continue" );
        line_number = 1;
        }
      cout << line << endl;
      }
    f.close();
    if (lines_per_screen != (unsigned)(-1))
      {
      cout << string( lines_per_screen -line_number, '\n' );
      pressenter( "End of file. Press ENTER for next" );
      }
    }

  return 0;
  }

Hope this helps.
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