Bài kiểm tra trắc nghiệm về JAVA P8

String expletive = “Expletive”;

String PG13 = “deleted”;

String message = expletive.substring(1,3) + PG13;

int age = 13;

String message = “PG” + age;

String greetings = “Hello”;

char letter = greetings.charAt(0);

double a, b;

if (a == 0)

if (b != 0) System.out.println(“Phuong trinh vo nghiem”);

else System.out.println(“Phuong trinh co vo so nghiem”);

else System.out.println(-b/a);

double a, b;

if (a == 0)

if (b != 0) System.out.println(“Phuong trinh vo nghiem”);

else System.out.println(“Phuong trinh co vo so nghiem”);

else System.out.println(-b/a);

double a, b;

if (a == 0)

if (b != 0) System.out.println(“Phuong trinh vo nghiem”);

else System.out.println(“Phuong trinh co vo so nghiem”);

else System.out.println(-b/a);