Operator Precedence vs Order of Evaluation

Question

The terms \'operator precedence\' and \'order of evaluation\' are very commonly used terms in programming and extremely important for a programmer to know. And, as far as I

Answer 1

I think it's only the

a++ + ++a

epxression problematic, because

a = a++ + ++a;

fits first in 3. but then in the 6. rule: complete evaluation before assignment.

So,

a++ + ++a

gets for a=1 fully evaluated to:

1 + 3   // left to right, or
2 + 2   // right to left

The result is the same = 4.

An

a++ * ++a    // or
a++ == ++a

would have undefined results. Isn't it?