c++] is it true or false that a class must have a default constructor defined in the definition of the class?

given the following class definition, how would you declare an object of the class, so that the object

automatically called the default constructor

class ItemClass

{

public:

ItemClass();

ItemClass(int newSize, float newCost);

int getSize();

float getCost();

void setSize(int newSize);

void setCost(float newCos);

private:

int size;

float cost;

};

a.temClass() myItem;

b.ItemClass myItem(1, 0.0);

c.ItemClass myItem;

d.ItemClass myItem();

e.

You can not do this