Can someone please explain how is the output of the code 3 ?

Question

int a[]= {3,4};
int x=0;
a[x]=++x;
cout <<a[0];

Answer 1

It shouldn't be. a[x] -> x is still 0, so the first entry.
=++x; -> x is incremented to 1 and is assigned to the first entry. So when a[0] is printed, it should output 1.

Answer 2

but I have​ checked it's 3