Quiz Discussion

Which of these can not be used for a variable name in Java?

• 1]

  identifier

• 2]

  keyword

• 3]

  identifier & keyword

• 4]

  none of the mentioned

What will be the output of the following Java program?

    public class array_output 
    {
        public static void main(String args[]) 
        {
       	    int array_variable [] = new int[10];
	    for (int i = 0; i < 10; ++i) {
                array_variable[i] = i/2;
                array_variable[i]++;
                System.out.print(array_variable[i] + " ");
                i++;
            }
 
        } 
    }

• 1]

  0 2 4 6 8

• 2]

  1 2 3 4 5

• 3]

   0 1 2 3 4 5 6 7 8 9

• 4]

  1 2 3 4 5 6 7 8 9 10

What will be the output of the following Java program?

    public class evaluate 
    {
        public static void main(String args[]) 
        {
            int a[] = {1,2,3,4,5};
	    int d[] = a;
	    int sum = 0;
	    for (int j = 0; j < 3; ++j)
                sum += (a[j] * d[j + 1]) + (a[j + 1] * d[j]);
	    System.out.println(sum);
        } 
    }

• 1]

  38

• 2]

  39

• 3]

  40

• 4]

  41

What will be the output of the following Java program?

    public class variable_scope 
    {
        public static void main(String args[]) 
        {
            int x;
            x = 5;
            {
	        int y = 6;
	        System.out.print(x + " " + y);
            }
            System.out.println(x + " " + y);
        } 
    }

• 1]

  5 6 5 6

• 2]

  5 6 5

• 3]

  Runtime error

• 4]

  Compilation error

Which of these can be returned by the operator &?

• 1]

  Integer

• 2]

  Boolean

• 3]

  Character

• 4]

  Integer or Boolean

What will be the output of the following Java program?

    public class dynamic_initialization 
    {
        public static void main(String args[]) 
        {
            double a, b;
            a = 3.0;
            b = 4.0;
	    double c = Math.sqrt(a * a + b * b);
	    System.out.println(c);
        } 
    }

• 1]

  5.0

• 2]

  25.0

• 3]

  7.0

• 4]

  Compilation Error