Dummy question

Question

What is the output of the following code?
int a=3;
int b=2;
b=a++;
cout<<++b;

I dont undestand why the answer is 4

If b = a++ that means // b= 2
cout << ++b; // that shood mean 2+1 right ?

Answer 1

b = a++ means "b takes a's value and a is incremented by 1" so after that a would be 4 and b would now be 3 (a's value before it was incremented) and the ++b would be 4

Answer 2

b gets the value of a and b is 3, then a increments by 1 and a is now 4.In next statement value of b, which is incremented by 1 is printed and then, the output is 4.

I understand partially

Why do we declare
int b=2;

wat is the point there

dont get me wrong but the question is from the Quiz beginers

is this code like this

b=2;
b=a++; (As statement of b=2?)

then I search for result what is b?
and if a++ = 3-1 and result b=2 then b = 3 and b++ = 3+1 ?

is this corect?