Thread: class

Code:

int MAX = 3;
int main (void)
{

 cCIRCLE c1;
 cTRIANGLE t1;	
 cRECTANGLE r1;
 cSHAPE arShape();  <---Error

}

how would i declare it so it intializes to c1,t1,and r1;

c1, t1 and r1 are all objects....what is arShape()?? Is it a function???

cSHAPE is a superclass

Yeah...but what is arShape()

arSHAPE is a variable intialized by cSHAPE class; it is a pointer to character.

> cSHAPE arShape(); <---Error

arShape is not a variable.... by putting ()'s you are saying its a function

here is the whole code:
HEADER FILE:

Code:

#ifndef __CSHAPE_H
#define __CSHAPE_H

#include <string.h>
#include <iostream.h>

class cSHAPE
{
   protected:	//Member Variables

	char* ptrName;

   public:     //Methods	
	 //Constructor	   
	   cSHAPE(const char* ptr) 
	   { 
		   ptrName=NULL;
		   if (ptr) 
		   {
			   ptrName = new char[strlen(ptr)+1]; 
			   strcpy(ptrName,ptr);
		   }
	   }

	   ~cSHAPE()
	   {
		   if (ptrName)
			   delete[] ptrName;
	   }

	   const char* getName() 
	   {
		   return(ptrName);
	   }
	   
  
	   virtual void displayShape() = 0;
	   virtual void eraseShape() = 0;
};

class cCIRCLE:public cSHAPE
{
public:
	cCIRCLE():cSHAPE("Circle")
	{}

	void displayShape()
	{
		cout << "-   " << ptrName << " has a radius "<< endl;
	}
	
	void eraseShape()
	{
		cout << "-   "  << "Erasing:" << ptrName << endl;
	}
};

class cTRIANGLE:public cSHAPE
{
public:
	cTRIANGLE():cSHAPE("Triangle")
	{}

	void displayShape()
	{
		cout << "-   "  << ptrName << " can be located in Bermuda "<< endl;
	}
	
	void eraseShape()
	{
		cout << "-   "  << "Erasing:" << ptrName<<  endl;
	}
};
class cRECTANGLE:public cSHAPE
{
public:
	cRECTANGLE():cSHAPE("Rectangle")
	{}

	void displayShape()
	{
		cout << "-   "  << ptrName << " may be a square if all sides are equal "<< endl;
	}

	void eraseShape()
	{
		cout << "-   "  << "Erasing:" << ptrName<< endl;
	}
};
#endif

CPP FILE:

Code:

#include "cshape.h"
#include <iostream.h>

const int MAX = 3;
void main (void)
{
	cCIRCLE c1;
	cTRIANGLE t1;	
	cRECTANGLE r1;

	char szStr1[] = "cir";
	char szStr2[] = "tri";
	char szStr3[] = "rec";
	cSHAPE arShape(????);
}

ok i have declared arShape

Code:

cSHAPE* arShape[MAX];

now how would i assign arShape[1] to c1, [2] to t1, and [3] to r1

Code:

cSHAPE *arShape[MAX]

where MAX is a const int

initalizes three pointers to cSHAPE object, now i am trying to assign each pointer to each shape (ie: arShape[0] to circle, arShape[1] to triangle and arShape[2] to rectangle)

k i got it

Code:

arShape = &c1
.
.
.

now i am trying to call a virtual function in my header file:

Code:

	   void doNonVirtual()
	   {
		   cout << "-   I am the doNonVirtual of the base class" << endl;
	   }

CPP FILE

Code:

	for (int i=0;i < MAX ; i++)
	{
		
		cout << " Object is a " << arShape[i]->getName() << endl;		
		cout << "calling doNonVirtual Function" << arShape[i].doNonVirtual();
		}
	system("PAUSE");
}

but i am getting a syntax error when i call the virtual function

but i am getting a syntax error when i call the virtual function

Which virtual function would that be? I don't see any in that code.