Java code question... I'm confused >_

Question

Consider this statement for computing the average of x, y, and z.
*
double average = x + y + z / 3;

Which of the following statements is correct?

A) The code always computes the correct average.

B) The code works correctly provided x, y, and z are variables of type double

C) The code works correctly provided x, y, and z are variables of type int

D) The code only gives the right answer when x = -y


Won't it always give the wrong average? because its missing the ( ) around the numbers it needs to add?

Answer 1

This question is testing your knowledge of operator precedence. the / will always get evaluated before the +. That means without any parens, z gets div'ed before getting added to y and x. Therefore, the only time this statement is correct is when x = -y, because:



(x + y) + (z / 3) == (x + y + z) / 3 when x = -y.

Answer 2

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Answer 3

see the code will get u the right ans. provided this is what u give. (x+y+z)/3 for 3 mark avg. if u give this x+y+z/3 it will take z/3 first for which dou is necessary and this gives the wrong ans. this is the only right and systematic approach to get the right answer.

Answer 4

The answer is D. If x is -y it means that:

average= -y + y + z / 3 = z / 3.

Answer 5

The answer must be D.



if x=-y then they disappear from the equation and make the formula correct. It would otherwise be wrong precisely because there are no brackets.



You are partly correct!

Answer 6

Answer is D