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public static int calculate(int x)

{
x = x + x;
x = x + x;
x = x + x;

return x;
}
Which of the following can be used to replace the body of calculate so that the modified version of calculate will return the same result as the original version for all values of x?

return 8 * x;
return 3 + x;
return 3 * x;
return 6 * x;
return 4 * x;

1 answer

Let's analyze the original calculate function step by step:

  1. The function receives an integer x as input.
  2. It doubles x: x = x + x; (Now, x is 2 * x).
  3. It doubles the result again: x = x + x; (Now, x is 4 * x).
  4. It doubles the result once more: x = x + x; (Now, x is 8 * x).
  5. Finally, it returns x.

From the above steps, we can infer that the original calculate function ultimately returns 8 * x.

Now, we need to find a replacement for the body of the function that also returns 8 * x.

Among the given options, the correct answer is:

return 8 * x;

This replacement will give the same result as the original function for all values of x. The other options do not yield 8 * x and would return different values based on the input x.