System.out.println("Sum of 3 and 4: " + calc.add(3, 4)); // Output: 7 System.out.println("Sum of 1, 2, and 3: " + calc.add(1, 2, 3)); // Output: 6 System.out.println ...

Most Library buildings (and some Houses as well) have elevators, which means it is possible to move between non-adjacent floors in a single action. Override the goToFloor(int n) method to reflect this ...