SCJP 5 Guide by K&B: Q5. Page 391 / 402

[Ravinder Singh]

Hi Ranchers,

Here is my question - Source: SCJP 5 Guide by K&B: Q5. Page 391 / 402

Given:

1. class Crivitch {
2. public static void main(String [] args) {
3. int x = 0;
4. // insert code here
5. do { } while (x++ < y);
6. System.out.println(x);
7. }
8. }

Which, inserted at line 4, produces the output 12?
A. int y = x;
B. int y = 10;
C. int y = 11;
D. int y = 12;
E. int y = 13;
F. None of the above will allow compilation to succeed.

Answer:
> C is correct. x reaches the value of 11, at which point the while test fails. x is then incremented (after the comparison test!), and the println() method runs.
> A, B, D, E, and F are incorrect based on the above.

My Question:
Since postfix operators (as well as prefix unary operators) have higher precedence than relational operators; why isn't x++ evaluated before < operator in the do{} while() expression in the question above? Going by that the correct answer should be option D.

---------
Ravinder

[Andy James]

When a postfix operator is used as part of an expression, the value of the variable in the expression is used before incrementing it. (That's how Java works!)

regards
Andy