#include <cstdlib>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main()
{
  string line;

  cout<<"Enter a file to open: ";

  if ( !getline ( cin, line ) ) {
    cerr<<"Input error"<<endl;
    return EXIT_FAILURE;
  }

  ifstream in ( line.c_str() );

  if ( !in ) {
    cerr<<"File open failure"<<endl;
    return EXIT_FAILURE;
  }

  // Copy the file into memory
  vector<string> file;

  while ( getline ( in, line ) )
    file.push_back ( line );

  // If the file was not exhausted, flag an error
  if ( !in.eof() )
    cerr<<"Error reading file"<<endl;

  // Display the entire contents of the file
  vector<string>::iterator it = file.begin();
  vector<string>::iterator end = file.end();

  while ( it != end )
    cout<< *it++ <<endl;

  // Locate a single line
  cout<<"The 5th line is ";

  if ( file.size() >= 5 )
    cout<<'\"'<< file[5] <<'\"'<<endl;
  else
    cout<<"not present"<<endl;
}