Practice

Flight


Design and code a class named Flight that holds information about an airline flight.  Upon instantiation, a Flight object may receive an int holding the flight number, and a null-terminated C-style string holding the flight destination.  The flight number should be positive-valued.  If the object receives a valid number and a string, the object accepts both.  Otherwise, the object assumes a safe empty state.  The object adopts a default output width of ten (10) characters for the flight number.  Your class does not impose any limitation on the number of characters in a Flight object.  Your design includes all of the member functions needed to accomodate this feature under a variety of applications, including the one below.

Your class also includes the following functions:

  • const char* destination() const - a query that returns the address of the first non-whitepsace character in the description of the Flight object;
  • int number() const - a query that returns the flight number; and
  • Flight& width(int) - a modifier that changes the width of the output field for the flight number to the integer value received if that value is a greater than that needed to display fully the flight number; if the integer value received is invalid, your object reverts to the default number of characters for the class.  Your function returns a reference to the current object as modified, so that your function can be used to insert the current object into the output stream directly as shown below; and
  • an insertion operator that inserts the flight number followed by the flight description into an output stream.  Your operator displays the flight number left-justified in the current field width, followed by a trailing space and the flight description.  Your operator accepts cascading. 
For example, consider the following program that uses your class

 #include <iostream>
 using namespace std;
 #include "Flight.h"

 void display(Flight flight) {

     cout << flight.width(2) << endl;

 }

 int main ( ) {
     Flight f, g(857, "Toronto");

     cout << g.width(9) << endl;
     f = g;
     display(f);
     cout << f.number() << endl;
     cout << f.description() << endl;
     return 0;
 }

This program produces the following output

 857       Toronto
 857        Toronto
 857
 Toronto








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