Please help me. I got 12 in postfix increment. It's supposed to add only one right

Question

https://code.sololearn.com/c2xJz8LHBp3F/?ref=app

Answer 1

Learning

b = a++;

Here you have assigned value of a to b so b = 11

Now after assigning a will be increase by 1 so a = 12

Answer 2

Learning

++x first increment then assign
x++ first assign then increment