Why won\'t my code run? I want to inherit everything from sailb.h class (base) into raceb.h class
(derived) and in main I want to set a raceb member variable equal to one of sailb member
variables but it does not work. language is c++
////////////////////////////////////Base Class////////////////////////////////////////
#ifndef sailb_h
#define sailb_h
#include
using namespace std;
class sailb {
public:
sailb();
double setWindSpeed(); //modifier
double getWindSpeed(); //accessor
private:
double windSpeed;
};
#endif
////////////////////////////////derived class/////////////////////////////////////////////////////////////////
#ifndef raceb_h
#define raceb_h
#include \"sailb.h\"
class raceb: public sailb {
public:
raceb();
void setDownWind();
double getDownWind();
p rivate:
double downWindSpeed;
};
#endif
///////////////main.cpp/////////////////////////////////////////////////////////////////////////////////////
#include
#include
#include \"sailb.h\"
#include \"raceb.h\"
using namespace std;
sailb::sailb() {windSpeed = 0;}
raceb::raceb() {}
void sailb::setWindSpeed() {
cout << \"What is the speed of the wind in knots.\ \";
cin >> windSpeed;
}
double sailb::getWindSpeed() {
return windSpeed;
}
void raceb::setDownWind() {
downWindSpeed = getWindSpeed();
}
double raceb::getDownWind() {
return downWindSpeed;
}
int main() {
sailb s;
s.setWindSpeed();
raceb r;
r.setDownWind();
cout << r.getDownWind();
///////// Output = 0. So the windSpeed is being set to the default windspeed, but i want it to be set
to the speed that the user inputs.
Solution
You are creating two different objects. Both of the objects share different memory locations. To
make it work what you are trying to achieve just use one object of derived class. Main function
will look like:
int main() {
raceb r;
r.setWindSpeed();
r.setDownWind();
cout << r.getDownWind();
return 0;
}
-----------
One more error I saw is you have defined the prototype of \"setWindSpeed();\" as \"double\".
Make it void. For example:
class sailb {
public:
sailb();
void setWindSpeed(); / <------------------ it was double in your code
double getWindSpeed(); //accessor
private:
double windSpeed;
};.
Why wont my code run I want to inherit everything from sailb.h cl.pdf
1. Why won't my code run? I want to inherit everything from sailb.h class (base) into raceb.h class
(derived) and in main I want to set a raceb member variable equal to one of sailb member
variables but it does not work. language is c++
////////////////////////////////////Base Class////////////////////////////////////////
#ifndef sailb_h
#define sailb_h
#include
using namespace std;
class sailb {
public:
sailb();
double setWindSpeed(); //modifier
double getWindSpeed(); //accessor
private:
double windSpeed;
};
#endif
////////////////////////////////derived class/////////////////////////////////////////////////////////////////
#ifndef raceb_h
#define raceb_h
#include "sailb.h"
class raceb: public sailb {
public:
raceb();
void setDownWind();
double getDownWind();
p rivate:
double downWindSpeed;
};
#endif
///////////////main.cpp/////////////////////////////////////////////////////////////////////////////////////
#include
#include
#include "sailb.h"
2. #include "raceb.h"
using namespace std;
sailb::sailb() {windSpeed = 0;}
raceb::raceb() {}
void sailb::setWindSpeed() {
cout << "What is the speed of the wind in knots. ";
cin >> windSpeed;
}
double sailb::getWindSpeed() {
return windSpeed;
}
void raceb::setDownWind() {
downWindSpeed = getWindSpeed();
}
double raceb::getDownWind() {
return downWindSpeed;
}
int main() {
sailb s;
s.setWindSpeed();
raceb r;
r.setDownWind();
cout << r.getDownWind();
///////// Output = 0. So the windSpeed is being set to the default windspeed, but i want it to be set
to the speed that the user inputs.
Solution
You are creating two different objects. Both of the objects share different memory locations. To
make it work what you are trying to achieve just use one object of derived class. Main function
will look like:
int main() {
raceb r;
r.setWindSpeed();
3. r.setDownWind();
cout << r.getDownWind();
return 0;
}
-----------
One more error I saw is you have defined the prototype of "setWindSpeed();" as "double".
Make it void. For example:
class sailb {
public:
sailb();
void setWindSpeed(); / <------------------ it was double in your code
double getWindSpeed(); //accessor
private:
double windSpeed;
};
