Question

What does each expression evaluate to? Assume x is 2 before each one.

• int num = x++ * 3;
  So this would be equivalent to (2)*3 or num=6 and x is now 3.

• num *= x;
  num =2*2 or 4

• (x < 2) && (x > 1)
  Becomes FALSE, because (2<2)=false and (2>1)=true so it’s false.

• (++x < 2) || (x < 1)
(3<2) is false and then ((2+1)<1) is also false, so it’s false?
  One question is in this case, is the preincrement applied to the variable before the break? Should the second x value be 3 or 2?
  I also have the same question for postincrement. Let’s say I have num=x++ *x++ where initial x=2. So is this 2*2 or 2*3?

Answer 1

It’s incremented before the “break” yes. Basically it’s the first thing java does (parenthesis are still the first ones actually). So in (++x < 2) || (++x < 3) the 2nd ++x happens after the first one if it isn’t true.