Consider the class as partially defined here:

//class PizzaOrder
class PizzaOrder
{
public:
static const int MAX_TOPPINGS = 20;

private:
// instance members
string toppings[MAX_TOPPINGS];
int numToppings;

// constructor
public PizzaOrder();

// accessor tells # toppings on pizza, i. e., # toppings in array
int getNumToppings() { return numToppings; }

// etc.
}

PizzaOrder::PizzaOrder()
{
numToppings = 0;
}
We want to write an instance method, addTopping() that will take a string parameter, topping, and add it to the toppings[] array at the next available location as determined by the int member numToppings. Assume any string passed in is valid and no other method modifies the toppings[] array or numToppings.

The client would call it like so:

somePizzaOrder. addTopping( "onions" );
Which is a correct definition for addTopping() based on what you see, above?

A. bool PizzaOrder::addTopping( string topping )
{
numToppings++;
if ( numToppings >= MAX_TOPPINGS )
return false;
toppings[numToppings] = topping;
return true;
}
B. void PizzaOrder::addTopping( string topping )
{
toppings[numToppings] = topping;
}
C. bool PizzaOrder::addTopping( string topping )
{
if ( numToppings >= MAX_TOPPINGS || numToppings < 0 )
return false;
toppings[numToppings++] = topping;
return true;
}
D. void PizzaOrder::addTopping( string topping )
{
toppings[numToppings++] = topping;
}
E. bool PizzaOrder::addTopping( string topping )
{
if ( numToppings >= MAX_TOPPINGS )
return false;
toppings[numToppings++] = topping;
return true;
}
F. bool PizzaOrder::addTopping( string topping )
{
if (numToppings > MAX_TOPPINGS)
return false;
toppings[numToppings++] = topping;
return true;
}