Struct , Pointers

[darren lim]

The program below, when activated, will ALWAYS hang when i retry the option
for eg. Menu -> Option 6 -> successful output -> menu ( its a do while loop )
and den from menu -> Option 6 -> output 1/2 and hang.

can anyone tell me what is wrong with my program here?

		else if(option == 6)
		{
			cout << "Enter elements for 1st sparse matrix: ";
			cin >> size;
			cout << "Enter elements for 2nd sparse matrix: ";
			cin >> size2;
			constructMatrix(sparseA, size);
			constructMatrix(sparseB, size2);
			cout << "\nArray information 1 - Row Major Order\n" << endl;
			printMatrix(sparseA, size);
			cout << "\nArray information 2 - Row Major Order\n" << endl;
			printMatrix(sparseB, size2);
			
			int sizeSum = addTwoMatrix(sparseA, sparseB, sparseC, size, size2);
			//nth to do with combined. should be add matrix error
			combineMatrix(sparseC, sizeSum);
			cout << "\nSum Array information 2 - Row Major Order\n" << endl;
			printMatrix(sparseC, (sizeSum));

		
		}
		else if(option == 7)
		{
			cout << "Enter elements for 1st sparse matrix: ";
			cin >> size;
			cout << "Enter elements for 2nd sparse matrix: ";
			cin >> size2;
			constructMatrix(sparseA, size);
			constructMatrix(sparseB, size2);
			cout << "\nArray information 1 - Row Major Order\n" << endl;
			printMatrix(sparseA, size);
			cout << "\nArray information 2 - Row Major Order\n" << endl;
			printMatrix(sparseB, size2);
			
			int sizeSub = subtractTwoMatrix(sparseA, sparseB, sparseC, size, size2);
			//nth to do with combined. should be sub matrix error
			combineMatrix(sparseC, sizeSub);
			cout << "\nDifference Array information 2 - Row Major Order\n" << endl;
			printMatrix(sparseC, (sizeSub)); 
			  	  
		
		}

using this call, i am doing these functions

int addTwoMatrix(Element *eleArray ,Element *eleArray2 ,Element *sparseC ,int size,int size2)
{
	Element *ptrA = &eleArray[0];
	Element *ptrB = &eleArray2[0];
	Element *ptrC = &sparseC[0];
	
	//SEE HERE . i assign 2 additional pointers so
	// They wont move my pointer A and B to other places.
	Element *testA = &eleArray[0];
	Element *testB = &eleArray2[0];
	Element *testC = &sparseC[0];
	int size3;

	cout << "\n size = " << size << endl;
	for(int q=0; q<size; q++)
	{
		cout << "testA value " << q << " is : " << testA -> i << " " 
			 << testA -> j << " " << getEle(testA -> value) << endl;
			 
		testA++;
	}
	cout << endl;
	cout << "\n size 2 = " << size2 <<endl;
	cout << endl;
	for(int r=0; r<size2; r++)
	{
		cout << "testB value " << r << " is : " << testB -> i << " " 
			 << testB -> j << " " << getEle(testB -> value) << endl;
			 
		testB++;

	}
	cout << endl;
	
	size3 = size+size2;
	
	for(int k = 0; k < size3; k++)
	{
		int *valueC;
		valueC = new int;
		
		if(ptrA->i != ptrB -> i && ptrA -> j != ptrB -> j)
		{
			*ptrC = *ptrA;
			
			cout << "testC value " << k << " is : " << testC -> i << " " 
			 << testC -> j << " " << getEle(testC -> value) << endl;
			 
			testC++;
			ptrA++;
			ptrC++;
		}
		
		else if(ptrA->i == ptrB ->i && ptrA -> j == ptrB -> j)
		{
			ptrC -> i = ptrA -> i;
			ptrC -> j = ptrA -> j;
			
			*valueC = getEle(ptrA -> value) + getEle(ptrB -> value);
			ptrC -> value = valueC;
			
			cout << "testC value " << k << " is : " << testC -> i << " " 
			 << testC -> j << " " << getEle(testC -> value) << endl;
			
			testC++;
			ptrA++;
			ptrB++;
			ptrC++;
			size3 --;
		}
		else
		{
			*ptrC = *ptrB;
			cout << "testC value " << k << " is : " << testC -> i << " " 
			 << testC -> j << " " << getEle(testC -> value) << endl;
			 
			testC++;
			ptrB++;
			ptrC++;
		}
		
		
	}
	
	return size3;
}

int subtractTwoMatrix(Element *eleArray ,Element *eleArray2 ,Element *sparseC ,int size,int size2)
{
	Element *ptrA = &eleArray[0];
	Element *ptrB = &eleArray2[0];
	Element *ptrC = &sparseC[0];
	int size3 =  size + size2;
	
	//SEE HERE . i assign 2 additional pointers so
	// They wont move my pointer A and B to other places.
	Element *testA = &eleArray[0];
	Element *testB = &eleArray2[0];
	Element *testC = &sparseC[0];

	cout << "\n size = " << size << endl;
	for(int q=0; q<size; q++)
	{
		cout << "testA value " << q << " is : " << testA -> i << " " 
			 << testA -> j << " " << getEle(testA -> value) << endl;
			 
		testA++;
	}
	
	cout << "\n size 2 = " << size2 <<endl;
	for(int r=0; r<size2; r++)
	{
		cout << "testB value " << r << " is : " << testB -> i << " " 
			 << testB -> j << " " << getEle(testB -> value) << endl;
			 
		testB++;

	}
	
	
	for(int k = 0; k < size3; k++)
	{
		int *valueC;
		valueC = new int;
		
		if(ptrA->i != ptrB -> i && ptrA -> j != ptrB -> j)
		{
			*ptrC = *ptrA;
			
			cout << "testC value " << k << " is : " << testC -> i << " " 
			 << testC -> j << " " << getEle(testC -> value) << endl;
			 
			testC++;
			ptrA++;
			ptrC++;
		}
		
		else if(ptrA->i == ptrB ->i && ptrA -> j == ptrB -> j)
		{
			ptrC -> i = ptrA -> i;
			ptrC -> j = ptrA -> j;
			
			*valueC = getEle(ptrA -> value) - getEle(ptrB -> value);
			ptrC -> value = valueC;

			cout << "testC value " << k << " is : " << testC -> i << " " 
			 << testC -> j << " " << getEle(testC -> value) << endl;
			
			testC++; 	    		
			ptrA++;
			ptrB++;
			ptrC++;
			
			if((*ptrC).value == 0)
			{
				size3 -= 2;
			}
			else
				-- size3;
		}
		else
		{
			ptrC -> i = ptrB -> i;
			ptrC -> j = ptrB -> j;
			
			*valueC = 0 - getEle(ptrB -> value);
			ptrC -> value = valueC;
			
			cout << "testC value " << k << " is : " << testC -> i << " " 
			 << testC -> j << " " << getEle(testC -> value) << endl;
			
			testC++;
			ptrB++;
			ptrC++;
		}	   
		
	} 
	
	return size3;
}