C / C++ / MFC

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for(x=0; x<=2; x++)

x=0 0<=2 TRUE
x=1 1<=2 TRUE
x=2 2<=2 TRUE
x=3 3<=2 FALSE

 
// Students Objects
 
	Node<Student> *s1,*s2,*s3,*s4;
	s1 = new Node<Student>;
	s1->data.setData("Hamza",12105092);
 
	s2 = new Node<Student>;
	s2->data.setData("Sherlock",12105102);
 
	s3 = new Node<Student>;
	s3->data.setData("Watson",12105022);
 
	s4 = new Node<Student>;
	s4->data.setData("Spidey",12105042);
 
// Courses Objects

	Course c1("OOP",3.52,"A");
	Course c2("DM",4,"A+");
	Course c3("DLD",3.2,"A-");
 
		
// Tree Creation

	CTree<Student> *tree1;
 
// Tree Insertion
	
	tree1 = new CTree<Student>();
	tree1->insert(new Student("",12105092));
	tree1->insert(new Student("",12105042));
	tree1->insert(new Student("",12105102));
	tree1->insert(new Student("",12105022));
	
// Merging Doubly Nodes With 2-3 Tree
	
	tree1->findOWN(new Student("",12105092))->merge(s1);	
	tree1->findOWN(new Student("",12105102))->merge(s2);	
	tree1->findOWN(new Student("",12105022))->merge(s3);
	tree1->findOWN(new Student("",12105042))->merge(s4);
 

/************************************
1. Creating An Empty List Of Students
************************************* */
	
	doublyLinkedList<Student> d1;
 
/*****************************
2. Adding Students To The List
****************************** */
	
	d1.insert(s1);
	d1.insert(s2);
	d1.insert(s3);
	d1.insert(s4);
 

 

 
template<class T>
CNode<T>* CTree<T>::findOWN(T*pKey)
{
    CNode<T> *pNodeFound= 0;
	bool bKeyFound = false; 
 
	search(pKey, &pNodeFound, &bKeyFound);
	if(bKeyFound == true &&
       TCompare(pKey, pNodeFound->getSmallKey()) == EQUAL)
    {
        return pNodeFound;  
	}
	else if(bKeyFound == true &&
            pNodeFound->getSize() == threeNode && 
            TCompare(pKey, pNodeFound->getBigKey()) == EQUAL)
    {
        return pNodeFound;
    }
    else
    {
        return 0;
    } 
}
 
template<class T>
int CTree<T>::TCompare(const T* const pT1, const T* const pT2) const
{
    int iReturnCode = FAILURE;
	
	if(*pT1 < *pT2)
    {
        iReturnCode = LESS;
    }
    else if(*pT2 < *pT1)
    {
        iReturnCode = GREATER;
    }
    else
    {
        iReturnCode = EQUAL;
    }
 
    return iReturnCode; 
}
 

1 - error LNK2019: unresolved external symbol "public: __thiscall CMyClass::CMyClass(void)" referenced in function "public: __thiscall CClientDlg::CClientsDlg(class CWnd *)" // occuring in DLG class

2 - error LNK2001: unresolved external symbol "public: __thiscall CMyClass::~CMyClass(void)" // occuring in DLG class

SomeClass *someClass = aFunction(); // aFunction returns a pointer to SomeClass.