Varia

Question 1

Tehe kahe int vahel

Answer 1

Tulemus alati int

Question 2

Tehtes on üks double

Answer 2

Tulemus alati double

Question 3

int a = 10;
int b = 3;
(double) a / b =

Answer 3

double 3.3333333333333335

Question 4

int a = 10;
int b = 3;
(double) (a / b) = 

Answer 4

double 3.0

Question 5

double aa = 10.0; double bb = 3.0;
(int) aa / bb = 

Answer 5

double 3.3333333333333335

Question 6

double aa = 10.0; double bb = 3.0;
(int) aa / (int) bb =

Answer 6

int 3

Question 7

double aa = 10.0; double bb = 3.0;
(int) (aa / bb) =

Answer 7

int 3

Question 8

int a = 10
var c = 3
var x = (double) (a / b) =

Answer 8

double 3.0

In Java, when declaring a variable as var, the compiler will
look for the type of the variable on the right side of the
expression. Here it can see it’s int 3, so var c is same as int
3. And a / b becomes an equation between two ints 10 / 3 = 3.
Though the casting (double) makes them become 3.0. And var x
becomes the equivalent of a double 3.0.

Question 9

ValueRange maksimum
on ___

Answer 9

Kaasaarvatud.

ValueRange.of(0, 2).isValidIntValue(2) == true

Question 10

Mida prindib kood?

for (int i = 1; i++ < 5; i--) { System.out.print(i); }

Answer 10

If it’s i++, i=1 is checked, but immediately after it passes into the loop, it becomes 2 and 2 is printed. i—Only happens in the end of the loop. If it were ++i, it would become 2 already prior to the condition check.

Question 11

Kuidas kontrollida, et BigDecimal money väärtus ei ole väiksem kui 0?

Answer 11

money.compareTo(BigDecimal.ZERO) < 0
Comparison returns -1 if the first value is less than the other value, 0 if equal,
1 if greater.

Question 12

Round double value moviePrice to 2 decimal places using BigDecimal.

Answer 12

// Round to 2 decimal places: // 13.3555 -> 13.36 return moviePrice.setScale(2, RoundingMode.HALF_UP);
It’s the best way to round everything, but project has to use Java 17 to do so.

Question 13

What are A, B, C values in the end?

int A = 3, B = 3, C = 0;
while (A-- > 0) {
    while (B-- > 0) {
        if (A + B == A) {
            C += A;
        }
    }
    if (A + B == B) {
        C += B;
    }
}

Answer 13

A = -1, B = -3, C = -1

1. First while loop: A=3 passes and is decremented to 2.
2. Second while loop: B=3 passes and is decremented to 2.
3. If sentence (2 + 2 == 2): Doesn’t start.
4. Second while loop: B=2 passes and is decremented to 1.
5. If sentence (2 + 1 == 2): Doesn’t start.
6. Second while loop: B=1 passes and is decremented to 0.
7. If sentence (2 + 0 == 2): Starts. C = 2.
8. SECOND WHILE LOOP IS CHECKED ONE LAST TIME. B=0 doesn’t pass but is decremented to -1.
9. If sentence (2 - 1 = -1): Doesn’t start.
10. First while loop: A=2 passes and is decremented to 1.
11. Second while loop: B=-1 doesn’t pass but is decremented to -2.
12. If sentence (1 - 2 = -2): Doesn’t start.
13. First while loop: A=1 passes and is decremented to 0.
14. Second while loop: B=-2 doesn’t pass but is decremented to -3
15. If sentence (0 - 3 = -3). Starts. C = -1.
16. FIRST WHILE LOOP IS CHECKED ONE LAST TIME. A=0 doesn’t pass but is decremented to -1.