180. Static Memory

Question.2

A Driver class tracks how many instances exist:

class Driver {
public:
   static int count;
   Driver()  { count++; }
   ~Driver() { count--; }
};
int Driver::count = 0;  // Definition

Driver a, b, c;
printf("%d", Driver::count);

What is printed?

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1 -- each object has its own count
3 -- static members are shared by all instances; three constructors incremented the same variable
0 -- count is initialized to 0 and never changes
Compilation error -- static members cannot be incremented

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