//As C++ is known by its difficulty, the manual memory management, here is a simple code that demonstrate it's mechanism #include using namespace std; class OPS{ public: OPS(int x, int y); ~OPS(); int getX() const; //all functions that promise the class not to apply any changes to the private variables of OPS have to be declared as int function() cons int getY() const; int getAdds() const; int getMult() const; int getDiv() const; int getSub() const; private: int *itsX; //declared as pointers int *itsY; };//OPS OPS :: OPS(int x, int y){ itsX = new int(x); //a new integer x is created in the Heap. This integer is assigned to itsX itsY = new int(y); } OPS :: ~OPS(){ cout << "Destructor Called" << endl;//be sure destructor is called delete itsX; //destructor delets the manual-created variables to avoid a lack in the memory delete itsY; } int OPS :: getX() const{ return *itsX; } int OPS :: getY() const{ return *itsY; } int OPS :: getAdds() const{ return (*itsX) + (*itsY); } int OPS :: getMult() const{ return (*itsX) * (*itsY); } int OPS :: getDiv() const{ return (*itsX)/(*itsY); } int OPS :: getSub() const{ return (*itsX) - (*itsY); } int main(){ OPS *nums = new OPS(10,20); //creating a new OPS object in the Heap int x = nums->getX(); int y = nums->getY(); cout << "x = " << nums->getX() << "\ty = " << nums->getY() << endl; cout << x << " + " << y << " = " << nums->getAdds() << endl; cout << x << " * " << y << " = " << nums->getMult() << endl; cout << x << " / " << y << " = " << nums->getDiv() << endl; cout << x << " - " << y << " = " << nums->getSub() << endl; delete nums; //deleting nums }

CalculatorWithManualMemoryManagement