Question about increment operators

Question

I just fooled around with the Code Playground,I came across this:

int x = 1;
int y = ++x + ++x;
cout<<y;
//outputs 6?

also,

int x = 1;
int y = ++x + x++;
cout<<y;

output is 5.
I can't figure out how I get these results. Btw in the challenges there is a question much like this that I keep getting wrong, that's why I tried these lines in the first place.

Answer 1

Looks like pre-incrementation is done first, then the expression is evaluated, then post-incrementation is done, then the result of the evaluation is assigned to the variable (that last part doesn't matter here, but try doing x = x++ for example).

You will only find stuff like this in exercises, so it's more of a trivia than anything else.