NOTE: Alternative solutions are perfectly fine.


Exercise 1
-----------

Board score: 10
Board score: 20
Board score: 40
Board score: 50
User score: 20
User1 score: 10
User2 score: 20
Board score: 50
Board score: 60
User score: 10

* Each correct answer is worth 1pts


Exercise 2
----------

correct return type  (double)                 [2pts]
correct initialization for sum (sum=0)        [2pts]
correct assignment in for loop (+=)           [2pts]
correct index in array coeff (coeff[i])       [2pts]
correct return statement inside method body   [2pts]



Correct program:

	public static double weightedSum(int[] arr, double[] coeff){
	    double sum = 0;
		
	    if (arr.length != coeff.length || arr.length == 0 ){
	        return 0;
	    }
	    
	    for(int i=0; i < arr.length; i++){
		sum+=arr[i] * coeff[i];
	    }
	    return sum;
	}


Exercise 3
----------

Line that will cause compilation error: 3             [2pts]
Reason: An object of the superclass can not be assigned to a variable of the subclass type

The following result will be printed to the console (after commenting out line 3):  [8 pts]

Calling constructor of C1
Calling constructor of C1
Calling constructor of C2
Default constructor of C2


Exercise 4
----------

Note: Alternative correct solutions are perfectly fine.


Block B: [1pts]

	private String position;


Block C: [1pts]

	this.name = name;
	this.position = position;

Block D: [2pts]

	this(e.name, e.position);

Block E: [2pts]

	return this.name.equals(e.name) && 
			this.position.equals(e.position);

Block F: [2pts]

	return this.position + " " + this.name;

Block G: [2pts]

	private int from;
	private int until;

Block H: [3pts]

	super(e);
	this.from=from;
	this.until=until;

Block I: [3pts]

	super("Bob Brown", "Doctor");
	this.from = 1;
	this.until = 9;

Block J: [3pts]

	return this.until - this.from + 1;

Block K: [3pts]

	return day >= from && day <= until;

Block L: [3pts]

	return super.toString() + " is on vacation from " +
			this.from + " until " + this.until + " of January";

Block M: [1pts]

	this.vacationList = vacationList;

Block N: [4pts]

	String res="";
	for(int i=0; i<this.vacationList.length; i++){
		res+=this.vacationList[i]+"\n";
	}
	return res;


Exercise 5
----------

a) 10pts

	public int numEmployeesAtWork(int day){
		int counter = 0;
		for(int i=0; i<this.vacationList.length; i++){
			if (!vacationList[i].isOnVacation(day)){
				counter++;
			}
		}
		return counter;
	}

b) 10 pts

	public int bestMeetingDay(){
		int bestDay = 1;
		int numEmployeesAtWork = this.numEmployeesAtWork(1);
		for(int i=2; i<32; i++){
			if(numEmployeesAtWork < this.numEmployeesAtWork(i)){
				bestDay = i;
				numEmployeesAtWork = this.numEmployeesAtWork(i);
			}
		}
		return bestDay;
	}




Exercise 6
----------

public int centeredAverage(int[] nums) {
  int min=nums[0];
  int max=nums[0];
  int sum=0;
  for(int i=0; i<nums.length; i++){
    sum+=nums[i];
    if(max<nums[i]){max=nums[i];}
    if(min>nums[i]){min=nums[i];}
  }
  return (sum-min-max)/(nums.length-2);

}