C++ beginner question

Question

Why does
int a = 3;
int b = 2;
b = a++;
cout << b;
Print as just the number 3?
I saw it as b changing to the value of a then adding 1, apparently this isn’t the case.
What’s actually happening?

Answer 1

++ after the name means the value increases after the operation.

So b gets a's old value 3, then a becomes 4.

Answer 2

++b

Answer 3

Don't do that, do b=++a