C/C++ Math Order of Operation

Question

So I know that C++ has an Operator Precedence and that

int x = ++i + i++;

is undefined because pre++ and post++ are at the same level and t

Answer 1

The first code snippet is undefined behaviour because variable i is being modified multiple times inbetween sequence points.

The second code snippet is defined behaviour and is equivalent to:

int i = (1 / 2) / 3;

as operator / has left-to-right associativity.