Chapter 13.12, Problem 13.21CP

What will the following program display on the screen?

#include <iostream>

using namespace std;

class Tank

{

private:

  int gallons;

public:

  Tank()

  { gallons = 50; }

  Tank(int gal)

  { gallons = gal; }

int getGallons()

  { return gallons; }

};

int main()

{

  Tank storage[3] = { 10, 20 };

for (int index = 0; index < 3; index++)

  cout ≪ storage[index].getGa11ons() ≪ endl;

  return 0;

}