560: Practice

Suppose that you try to fix the problem raised in Segment 548 by defining additional functions specialized to the various railroad_car subclasses:

double ordinary_capacity_function (box_car b) { 
  return b.capacity ( ); 
} 
double ordinary_capacity_function (tank_car t) { 
  return t.capacity ( ); 
} 
double ordinary_capacity_function (engine e) { 
  return e.capacity ( ); 
} 
double ordinary_capacity_function (caboose c) { 
  return c.capacity ( ); 
} 

Does the program perform correctly with these additional functions? Explain your answer.