Problem 1: [5 points]
}
#include <iostream.h>
#include "balloon.h"
int main()
{
Balloon trip;
int rise; // how high to fly
int duration; // how long to cruise
cout << "Welcome to the windbag emporium."<<endl;
cout << "You'll rise up, cruise a while, then descend."<<endl;
cout << "How high (in meters) do you want the balloon to rise? ";
cin >> rise;
cout << "How long (in seconds) do you want the balloon to cruise? ";
cin >> duration;
trip.Ascend(rise); // ascend to specified height
trip.Cruise(duration); // cruise for specified time steps
trip.Descend(rise/2); // descend to half the initial altitude
trip.Cruise(duration); // cruise for specified time steps
trip.Descend(0); // descend to earth
return 0;
Problem 2: [15 points]
1. The Burn() function accomplishes two tasks. First, it increases the
value of myAltitude by ALT_CHANGE (ALT_CHANGE is a constant variable equal to
10). Second, the BurnMessage() function is called to print a message.
2. void Balloon::Burn()
{
if(myAltitude <= 50)
myAltitude = myAltitude + ALT_CHANGE;
else
myAltitude = myAltitude + 15;
BurnMessage();
}
3. First, move the following function headers from the private to the public
section of Balloon.h:
void Burn();
void Vent();
void AltitudeMessage();
Then adapt fly.cc so that it calls Burn() and Vent() instead of Ascend() and
Descend(). Note that the GetAltitude() function returns the balloon's current height
(i.e. the value of the private variable, myAltitude).
#include <iostream.h>
#include "balloon.h"
int main()
{
Balloon red_balloon;
int rise; // how high to fly
int duration; // how long to cruise
cout << "Welcome to the windbag emporium."<<endl;
cout << "You'll rise up, cruise a while, then descend."<<endl;
cout << "How high (in meters) do you want the balloon to rise? ";
cin >> rise;
cout << "How long (in seconds) do you want the balloon to cruise? ";
cin >> duration;
cout << "***** (Height = 0) Ascending to "<< rise << " meters *****"<<endl;
while(red_balloon.GetAltitude() < rise)
{
red_balloon.AltitudeMessage();
red_balloon.Burn();
}
red_balloon.Cruise(duration);
cout << "***** (Height = "<< rise << ") Descending to 0 meters *****"<<endl;
while(red_balloon.GetAltitude() > 0)
{
red_balloon.AltitudeMessage();
red_balloon.Vent();
}
return 0;
}