Programming Forums > Application Development > C++

-=PARADOX=- · Nov 22nd, 2005, 1:01 PM

Hi there

Can someone tell me what a abstract class is? ... and a pure abstract class?

Thanks in advance

Kilo · Nov 22nd, 2005, 1:04 PM

lol O_o, i would like to know too

Ooble · Nov 22nd, 2005, 1:14 PM

You guys already know Google is your best friend. Now you need to learn Programmer rule #2: Wikipedia is your second-best.

http://en.wikipedia.org/wiki/Class_(...ncrete_classes

Kilo · Nov 22nd, 2005, 1:22 PM

why thank you Ooble! Btw: google is going to the crapper! I wouldn't advise anyone use it O_o http://www.searchlores.org <- that website offers the power to find anything (picture,file,song) anywhere on the net... at anytime!!! it warns you of the power that site has to offer.. check it out?

-=PARADOX=- · Nov 22nd, 2005, 1:28 PM

Thanks for the advise

Ooble · Nov 22nd, 2005, 1:38 PM

Can you explain exactly how that one's better than Google?

Kilo · Nov 22nd, 2005, 1:42 PM

searchlores.. is not an engine itself! It is a Fravia site(you might have heard of him?) that contains GOBS of information about engines, and methods of find anything and everything you want! Trust me once you get in there and start reading, good luck stopping!

EDIT: btw, there are hidden things everywhere!!
on the first page the words - > Bk:flange of myth ~ What's new
is 18 different links!!!

-=PARADOX=- · Nov 22nd, 2005, 2:28 PM

So I have one base pure abstract class named 'CFigura.h':

(Toggle Plain Text)

class CFigura
{

protected:
        static unsigned count;
        virtual ~CFigura()=0;
public:
        virtual double Area()=0;
        virtual double Perimetro()=0;
};

and one child class 'CCirculo.h':

(Toggle Plain Text)

#include "CFigura.h"

class CCirculo : public CFigura
{
        static const double PI;
        unsigned raio;
public:
        CCirculo( unsigned );
        virtual ~CCirculo();
        double Area();
        double Perimetro();
};

when I try to compile it says:
"Unresolved external CFigura::~CFigura referenced from CCirculo"

What's wrong?

Nov 22nd, 2005, 1:01 PM	#1
-=PARADOX=- Programmer Join Date: Oct 2005 Location: Portugal Posts: 53 Rep Power: 3	Abstract class Hi there Can someone tell me what a abstract class is? ... and a pure abstract class? Thanks in advance

Nov 22nd, 2005, 1:14 PM	#3
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 8	You guys already know Google is your best friend. Now you need to learn Programmer rule #2: Wikipedia is your second-best. http://en.wikipedia.org/wiki/Class_(...ncrete_classes __________________ Me :: You :: Them

Nov 22nd, 2005, 1:22 PM	#4
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	why thank you Ooble! Btw: google is going to the crapper! I wouldn't advise anyone use it O_o http://www.searchlores.org <- that website offers the power to find anything (picture,file,song) anywhere on the net... at anytime!!! it warns you of the power that site has to offer.. check it out? __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

Nov 22nd, 2005, 1:38 PM	#6
Ooble I eat cake for breakfast. Join Date: Jul 2004 Location: In my box. Posts: 4,434 Rep Power: 8	Can you explain exactly how that one's better than Google? __________________ Me :: You :: Them

Nov 22nd, 2005, 1:42 PM	#7
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	searchlores.. is not an engine itself! It is a Fravia site(you might have heard of him?) that contains GOBS of information about engines, and methods of find anything and everything you want! Trust me once you get in there and start reading, good luck stopping! EDIT: btw, there are hidden things everywhere!! on the first page the words - > Bk:flange of myth ~ What's new is 18 different links!!! __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

Nov 22nd, 2005, 1:04 PM	#2
Kilo Expert Programmer Join Date: Nov 2005 Location: In Pink Clam? Posts: 542 Rep Power: 0	lol O_o, i would like to know too __________________ "When in Rome, Do as the Romans Do" "Beauty is in the eye of the BEER holder" "Save your breath your going to need it for your blow up doll later" SearchLores.org

Nov 22nd, 2005, 1:28 PM	#5
-=PARADOX=- Programmer Join Date: Oct 2005 Location: Portugal Posts: 53 Rep Power: 3	Thanks for the advise

Nov 22nd, 2005, 2:28 PM	#8
-=PARADOX=- Programmer Join Date: Oct 2005 Location: Portugal Posts: 53 Rep Power: 3	So I have one base pure abstract class named 'CFigura.h': (Toggle Plain Text) class CFigura { protected: static unsigned count; virtual ~CFigura()=0; public: virtual double Area()=0; virtual double Perimetro()=0; }; class CFigura { protected: static unsigned count; virtual ~CFigura()=0; public: virtual double Area()=0; virtual double Perimetro()=0; }; and one child class 'CCirculo.h': (Toggle Plain Text) #include "CFigura.h" class CCirculo : public CFigura { static const double PI; unsigned raio; public: CCirculo( unsigned ); virtual ~CCirculo(); double Area(); double Perimetro(); }; #include "CFigura.h" class CCirculo : public CFigura { static const double PI; unsigned raio; public: CCirculo( unsigned ); virtual ~CCirculo(); double Area(); double Perimetro(); }; when I try to compile it says: "Unresolved external CFigura::~CFigura referenced from CCirculo" What's wrong?

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Programming Forums > Application Development > C++

Abstract class