Here are some useful code fragements for Java.  I haven't included
anything for C++ since most students are using Java and if you don't
know how to parse a string of words in C++ then perhaps you want to
use Java since more support is provided. 

<hr>

<pre>

//ArrayList is in this package

import java.util.*;

//Definition for infinity

  public static final double INF = java.lang.Double.POSITIVE_INFINITY;

//--------------------------------- reading airport-data.txt --------------------------------

    BufferedReader r;
    try {
      InputStream is = new FileInputStream("airport-data.txt");
      r = new BufferedReader(new InputStreamReader(is));
    }
    catch (IOException e) {
      System.out.println("IOException while opening airport-data.txt\n" + e);
      return;
    }
    try {
      String nextline = r.readLine();
      StringTokenizer st = new StringTokenizer(nextline);
      int numAirports = Integer.parseInt(st.nextToken());
      for (int i = 0; i < numAirports; i++){
	nextline = r.readLine();
	st = new StringTokenizer(nextline);
	String airportCode = st.nextToken();
	int gmtOffset = Integer.parseInt(st.nextToken());

//     You now have the airportCode and gmtOffset to use as you want
      }
    }
    catch (IOException e) {
      System.out.println("IOException while reading sequence from " +
			"airport-data.txt\n" + e);


//--------------------------------- reading flight-data.txt --------------------------------

    BufferedReader r;
    try {
      InputStream is = new FileInputStream("flight-data.txt");
      r = new BufferedReader(new InputStreamReader(is));
    }
    catch (IOException e) {
      System.out.println("IOException while opening flight-data.txt\n" + e);
      return;
    }
    try {
      boolean stop = false;
      while (!stop){
	String nextline = r.readLine();
	if (nextline == null) // end of file
	  stop = true;
	else {
	  StringTokenizer st = new StringTokenizer(nextline);

	  String airline = st.nextToken();
	  int flightNum = Integer.parseInt(st.nextToken());

	  String departureAirportCode = st.nextToken();
	  int localDepartTime = Integer.parseInt(st.nextToken());
          boolean departAM = st.nextToken().equals("A");

	  String arrivalAirportCode = st.nextToken();
	  int localArriveTime = Integer.parseInt(st.nextToken());
          boolean arriveAM = st.nextToken().equals("A");

// The above reads in the airline, flight number, and the 3 fields (airport, time, A or P)
//   for both the departure and arrival airports.  You take it from here.

	}
      }
    }
    catch (IOException e) {
      System.out.println("IOException while reading sequence from " +
			 "flight-data.txt\n" + e);
</pre>