Chọn vòng lặp đúng:

while (int i < 7) { i++; System.out.println("i is " + i); }

int i = 3; while (i) { System.out.println("i is " + i); }

int j = 0; for (int k = 0; j + k != 10; j++, k++) { System.out.println("j is " + j + " k is " + k); }