Programming Forums > Application Development > C++

Twilight · Jun 5th, 2006, 12:12 AM

I've done a fair share of programming over the last couple of years, but I was wondering if anyone had any exercises dealing with Inheritance or Polymorphism to help me learn the concepts. Old Uni assignments anyone?

Barring that, just where I can go to learn this kinda stuff would be cool.

Soulstorm · Jun 5th, 2006, 2:23 AM

for your second question, I think you should check this out: http://www.cplusplus.com/doc/tutorial/

apart from that, I think you need a book on C++ to help you with the exercises... There is a free electronic book that will teach you the concepts of C++ polymorphism and Inheritance. It's called Thinking in C++ and it's free.

rsnd · Jun 6th, 2006, 10:24 AM

Even thou things are done a bit differently, Java is really good for learning OOP concepts. The ideas are the same (almost). There should be plenty of c++ classes tutorials around. I really liked the "wrox press c++ something" ebook. I thaught its really good for beginners. Came with my vc++ 6.0 compiler package.

If you are just looking for a challenge or "assignment", make a html parser. Should be good enough exercize for oo stuff.

Harakim · Jun 6th, 2006, 2:24 PM

We had to make a farm with different animals, where animals was inherited from the animal class. It was actually quite entertaining.

Basically, you would be able to cycle through the animals. You could choose from three buttons: Speak, Feed, Play Old McDonald.

It was kind of like GigaPet, because you had to feed them or else they would die and then when you played the old McDonald song you wouldn't hear them moo/crow/etc.

Anyway, I thought that project was pretty fun because my group took some liberties with it.

bl00dninja · Jun 6th, 2006, 5:09 PM

i don't remember exactly what the hell this really does or is, but i think it was a simple test program for mult inheritance and polymorphism.

(Toggle Plain Text)

#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;

class abstractBaseClass
{
public:
	abstractBaseClass()					{cout<<"abstractBaseClass constructor called"<<endl;}
	virtual ~abstractBaseClass()		{cout<<"abstractBaseClass destructor called"<<endl;}

	virtual void printObjectData() = 0;
};
//////////////////////////////////////////////////////////////////////////////////////////
class secondaryParent : virtual public abstractBaseClass
{
protected:
	int P;
public:
	secondaryParent(int pInput = 0)			{P = pInput; cout<<"secondaryParent constructor called"<<endl;}
	virtual ~secondaryParent()				{cout<<"secondaryParent destructor called"<<endl;}
	int getP()					{return P;}
};

class tertiaryParent : virtual public abstractBaseClass
{
protected:
	int Q;
public:
	tertiaryParent(int qInput = 0)			{Q = qInput; cout<<"tertiaryParent constructor called"<<endl;}
	virtual ~tertiaryParent()				{cout<<"tertiaryParent destructor called"<<endl;}
	int getQ()					{return Q;}
};
//////////////////////////////////////////////////////////////////////////////////////////
class child1 : public secondaryParent, public tertiaryParent
{
public:
	child1()							 {cout<<"child1 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;}
	virtual ~child1()					 {cout<<"child1 destructor called"<<endl;}
	virtual void printObjectData()		 {cout<<"child1 "<<getP()<<" "<<getQ()<<endl;}
};

class child2 : public secondaryParent, public tertiaryParent
{
public:
	child2()							 {cout<<"child2 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;}
	virtual ~child2()					 {cout<<"child2 destructor called"<<endl;}
	virtual void printObjectData()		 {cout<<"child2 "<<getP()<<" "<<getQ()<<endl;}
};

class child3 : public secondaryParent, public tertiaryParent
{
public:
	child3()							 {cout<<"child3 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;}
	virtual ~child3()					 {cout<<"child3 destructor called"<<endl;}
	virtual void printObjectData()		 {cout<<"child3 "<<getP()<<" "<<getQ()<<endl;}
};
///////////////////////////////////////////////////////////////////////////////////////
int main()
{
	srand(time(0));//seed rand
	int randChoice, P, Q;
	
	P = ((rand()%100 + 1));
	Q = ((rand()%1000 + 1));

	abstractBaseClass* x;//pointer to base class

	randChoice = rand()%3 + 1;//pick which object to instantiate

	switch (randChoice)
	{
	case 1:  
		x = new child1();
		break;

	case 2:
		x = new child2();
		break;

	case 3:
		x = new child3();
		break;
	}//end switch

	x->printObjectData();

	delete x;//delete base class pointer

	return 0;
}//end main

#include <iostream>
#include <ctime>
#include <cstdlib>
using namespace std;

class abstractBaseClass
{
public:
	abstractBaseClass()					{cout<<"abstractBaseClass constructor called"<<endl;}
	virtual ~abstractBaseClass()		{cout<<"abstractBaseClass destructor called"<<endl;}

	virtual void printObjectData() = 0;
};
//////////////////////////////////////////////////////////////////////////////////////////
class secondaryParent : virtual public abstractBaseClass
{
protected:
	int P;
public:
	secondaryParent(int pInput = 0)			{P = pInput; cout<<"secondaryParent constructor called"<<endl;}
	virtual ~secondaryParent()				{cout<<"secondaryParent destructor called"<<endl;}
	int getP()					{return P;}
};

class tertiaryParent : virtual public abstractBaseClass
{
protected:
	int Q;
public:
	tertiaryParent(int qInput = 0)			{Q = qInput; cout<<"tertiaryParent constructor called"<<endl;}
	virtual ~tertiaryParent()				{cout<<"tertiaryParent destructor called"<<endl;}
	int getQ()					{return Q;}
};
//////////////////////////////////////////////////////////////////////////////////////////
class child1 : public secondaryParent, public tertiaryParent
{
public:
	child1()							 {cout<<"child1 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;}
	virtual ~child1()					 {cout<<"child1 destructor called"<<endl;}
	virtual void printObjectData()		 {cout<<"child1 "<<getP()<<" "<<getQ()<<endl;}
};

class child2 : public secondaryParent, public tertiaryParent
{
public:
	child2()							 {cout<<"child2 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;}
	virtual ~child2()					 {cout<<"child2 destructor called"<<endl;}
	virtual void printObjectData()		 {cout<<"child2 "<<getP()<<" "<<getQ()<<endl;}
};

class child3 : public secondaryParent, public tertiaryParent
{
public:
	child3()							 {cout<<"child3 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;}
	virtual ~child3()					 {cout<<"child3 destructor called"<<endl;}
	virtual void printObjectData()		 {cout<<"child3 "<<getP()<<" "<<getQ()<<endl;}
};
///////////////////////////////////////////////////////////////////////////////////////
int main()
{
	srand(time(0));//seed rand
	int randChoice, P, Q;
	
	P = ((rand()%100 + 1));
	Q = ((rand()%1000 + 1));

	abstractBaseClass* x;//pointer to base class

	randChoice = rand()%3 + 1;//pick which object to instantiate

	switch (randChoice)
	{
	case 1:  
		x = new child1();
		break;

	case 2:
		x = new child2();
		break;

	case 3:
		x = new child3();
		break;
	}//end switch

	x->printObjectData();

	delete x;//delete base class pointer

	return 0;
}//end main

Twilight · Jun 6th, 2006, 9:14 PM

Thanks for the code example, right now I don't really understand whats happening, but I do have "C++ From the Beginning" by Jan Skansholm from my first year programming course, which has 3 chapters on this kinda stuff, so I should be able to pick up the theory there. I just need code problems to practice it on.

Jun 5th, 2006, 12:12 AM	#1
Twilight Programmer Join Date: Apr 2006 Location: Calgary, Alberta Posts: 67 Rep Power: 3	Learning New OOP Concepts I've done a fair share of programming over the last couple of years, but I was wondering if anyone had any exercises dealing with Inheritance or Polymorphism to help me learn the concepts. Old Uni assignments anyone? Barring that, just where I can go to learn this kinda stuff would be cool.

Jun 5th, 2006, 2:23 AM	#2
Soulstorm Hobbyist Programmer Join Date: Jan 2006 Location: Menidi, Athens, Greece Posts: 239 Rep Power: 3	for your second question, I think you should check this out: http://www.cplusplus.com/doc/tutorial/ apart from that, I think you need a book on C++ to help you with the exercises... There is a free electronic book that will teach you the concepts of C++ polymorphism and Inheritance. It's called Thinking in C++ and it's free. __________________ Project::Soulstorm (personal homepage)

Jun 6th, 2006, 10:24 AM	#3
rsnd Hobbyist Programmer Join Date: Jun 2005 Location: Helltown Posts: 162 Rep Power: 4	Even thou things are done a bit differently, Java is really good for learning OOP concepts. The ideas are the same (almost). There should be plenty of c++ classes tutorials around. I really liked the "wrox press c++ something" ebook. I thaught its really good for beginners. Came with my vc++ 6.0 compiler package. If you are just looking for a challenge or "assignment", make a html parser. Should be good enough exercize for oo stuff. __________________ Spread your wings and fly! Chicken! Last edited by rsnd; Jun 6th, 2006 at 10:44 AM.

Jun 6th, 2006, 5:09 PM	#5
bl00dninja Programming Guru Join Date: Oct 2004 Location: namespace std Posts: 1,246 Rep Power: 5	i don't remember exactly what the hell this really does or is, but i think it was a simple test program for mult inheritance and polymorphism. (Toggle Plain Text) #include <iostream> #include <ctime> #include <cstdlib> using namespace std; class abstractBaseClass { public: abstractBaseClass() {cout<<"abstractBaseClass constructor called"<<endl;} virtual ~abstractBaseClass() {cout<<"abstractBaseClass destructor called"<<endl;} virtual void printObjectData() = 0; }; ////////////////////////////////////////////////////////////////////////////////////////// class secondaryParent : virtual public abstractBaseClass { protected: int P; public: secondaryParent(int pInput = 0) {P = pInput; cout<<"secondaryParent constructor called"<<endl;} virtual ~secondaryParent() {cout<<"secondaryParent destructor called"<<endl;} int getP() {return P;} }; class tertiaryParent : virtual public abstractBaseClass { protected: int Q; public: tertiaryParent(int qInput = 0) {Q = qInput; cout<<"tertiaryParent constructor called"<<endl;} virtual ~tertiaryParent() {cout<<"tertiaryParent destructor called"<<endl;} int getQ() {return Q;} }; ////////////////////////////////////////////////////////////////////////////////////////// class child1 : public secondaryParent, public tertiaryParent { public: child1() {cout<<"child1 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;} virtual ~child1() {cout<<"child1 destructor called"<<endl;} virtual void printObjectData() {cout<<"child1 "<<getP()<<" "<<getQ()<<endl;} }; class child2 : public secondaryParent, public tertiaryParent { public: child2() {cout<<"child2 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;} virtual ~child2() {cout<<"child2 destructor called"<<endl;} virtual void printObjectData() {cout<<"child2 "<<getP()<<" "<<getQ()<<endl;} }; class child3 : public secondaryParent, public tertiaryParent { public: child3() {cout<<"child3 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;} virtual ~child3() {cout<<"child3 destructor called"<<endl;} virtual void printObjectData() {cout<<"child3 "<<getP()<<" "<<getQ()<<endl;} }; /////////////////////////////////////////////////////////////////////////////////////// int main() { srand(time(0));//seed rand int randChoice, P, Q; P = ((rand()%100 + 1)); Q = ((rand()%1000 + 1)); abstractBaseClass* x;//pointer to base class randChoice = rand()%3 + 1;//pick which object to instantiate switch (randChoice) { case 1: x = new child1(); break; case 2: x = new child2(); break; case 3: x = new child3(); break; }//end switch x->printObjectData(); delete x;//delete base class pointer return 0; }//end main #include <iostream> #include <ctime> #include <cstdlib> using namespace std; class abstractBaseClass { public: abstractBaseClass() {cout<<"abstractBaseClass constructor called"<<endl;} virtual ~abstractBaseClass() {cout<<"abstractBaseClass destructor called"<<endl;} virtual void printObjectData() = 0; }; ////////////////////////////////////////////////////////////////////////////////////////// class secondaryParent : virtual public abstractBaseClass { protected: int P; public: secondaryParent(int pInput = 0) {P = pInput; cout<<"secondaryParent constructor called"<<endl;} virtual ~secondaryParent() {cout<<"secondaryParent destructor called"<<endl;} int getP() {return P;} }; class tertiaryParent : virtual public abstractBaseClass { protected: int Q; public: tertiaryParent(int qInput = 0) {Q = qInput; cout<<"tertiaryParent constructor called"<<endl;} virtual ~tertiaryParent() {cout<<"tertiaryParent destructor called"<<endl;} int getQ() {return Q;} }; ////////////////////////////////////////////////////////////////////////////////////////// class child1 : public secondaryParent, public tertiaryParent { public: child1() {cout<<"child1 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;} virtual ~child1() {cout<<"child1 destructor called"<<endl;} virtual void printObjectData() {cout<<"child1 "<<getP()<<" "<<getQ()<<endl;} }; class child2 : public secondaryParent, public tertiaryParent { public: child2() {cout<<"child2 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;} virtual ~child2() {cout<<"child2 destructor called"<<endl;} virtual void printObjectData() {cout<<"child2 "<<getP()<<" "<<getQ()<<endl;} }; class child3 : public secondaryParent, public tertiaryParent { public: child3() {cout<<"child3 constructor called"<<endl; P = secondaryParent::P; Q = tertiaryParent::Q;} virtual ~child3() {cout<<"child3 destructor called"<<endl;} virtual void printObjectData() {cout<<"child3 "<<getP()<<" "<<getQ()<<endl;} }; /////////////////////////////////////////////////////////////////////////////////////// int main() { srand(time(0));//seed rand int randChoice, P, Q; P = ((rand()%100 + 1)); Q = ((rand()%1000 + 1)); abstractBaseClass* x;//pointer to base class randChoice = rand()%3 + 1;//pick which object to instantiate switch (randChoice) { case 1: x = new child1(); break; case 2: x = new child2(); break; case 3: x = new child3(); break; }//end switch x->printObjectData(); delete x;//delete base class pointer return 0; }//end main __________________ i put on my robe and wizard hat... Have you ever heard of Plato, Aristotle, Socrates?...Morons.

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Jun 6th, 2006, 2:24 PM	#4
Harakim Hobbyist Programmer Join Date: May 2006 Location: West Jordan, Utah, United States Posts: 176 Rep Power: 3	We had to make a farm with different animals, where animals was inherited from the animal class. It was actually quite entertaining. Basically, you would be able to cycle through the animals. You could choose from three buttons: Speak, Feed, Play Old McDonald. It was kind of like GigaPet, because you had to feed them or else they would die and then when you played the old McDonald song you wouldn't hear them moo/crow/etc. Anyway, I thought that project was pretty fun because my group took some liberties with it.

Jun 6th, 2006, 9:14 PM	#6
Twilight Programmer Join Date: Apr 2006 Location: Calgary, Alberta Posts: 67 Rep Power: 3	Thanks for the code example, right now I don't really understand whats happening, but I do have "C++ From the Beginning" by Jan Skansholm from my first year programming course, which has 3 chapters on this kinda stuff, so I should be able to pick up the theory there. I just need code problems to practice it on.

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Programming Forums > Application Development > C++

Learning New OOP Concepts