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4 / 10Java -operatorsHardJava

Which of the following expressions evaluates to `true` for all non-negative integers `n`?

  1. `(n & 1) == 0`

  2. `(n | 1) == n`

  3. `(n ^ 0) == n`

  4. `(n >> 1) > 0`

Show answer & explanation

Correct answer

`(n ^ 0) == n`

Explanation

`(n & 1) == 0` is true only for even numbers; `(n | 1) == n` is true only for odd; `(n ^ 0) == n` is an identity for any `n`. So that is always true.

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All 10 Java -operators questions

  1. 1.Given the expression `int a = 5; int b = 10; int c = ++a * b-- + a;`, what is the value of `c` after evaluation?
  2. 2.What is the result of evaluating `(2 + 3) * 4 == 20 || !(5 > 3) && (6 / 2 == 3)` in Java?
  3. 3.Given `int x = 7; int y = 3; int z = x ^ y;` and then `z = z << 1;`, what is the final value of `z`?
  4. 4.Which of the following expressions evaluates to `true` for all non-negative integers `n`?
  5. 5.Consider `short s = 10; s = s + 5;` and `short t = 10; t += 5;`.
  6. 6.What is the output of the following code?
  7. 7.Given `int x = 5; x = x++ + ++x;`, what is the final value of `x`?
  8. 8.What is the value of `(int) (3.9 + 5.1 / 2.0)` in Java?
  9. 9.Given `boolean a = true; boolean b = false; boolean c = a | b & !a;`, what is the value of `c`?
  10. 10.Which of these expressions is guaranteed to produce arithmetic overflow?