Multiple choice technology programming languages

What is the result that will be printed out ? void aMethod() { float f = (1 / 4) * 10; int i = Math.round(f); System.out.println(i); }

  1. 2

  2. 0

  3. 3

  4. 2.5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The key issue here is that (1 / 4) performs integer division, which results in 0, not 0.25. Then 0 * 10 = 0, so f = 0.0. Math.round(0.0) returns 0, which is printed out. This demonstrates the importance of understanding that integer division truncates toward zero in Java, which can lead to unexpected results when mixed with floating-point operations.

AI explanation

To answer this question, let's go through the code step by step:

  1. float f = (1 / 4) * 10; In this line, the expression (1 / 4) performs integer division, which results in 0. The expression 0 * 10 evaluates to 0. Since the result is assigned to a float variable f, the value 0 is automatically converted to a float value of 0.0.

  2. int i = Math.round(f); The Math.round() method rounds the float value to the nearest integer. In this case, f is 0.0, which is already an integer value. So, the value of i will also be 0.

  3. System.out.println(i); Finally, the value of i which is 0 will be printed.

Therefore, the result that will be printed out is 0, which corresponds to option B.

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