what is the output and how?

Question

int a=3;
int b=2;
b=a++;
cout<<++b;

Answer 1

b = a++; // post increment
This statement makes a = 4 and b = 3

cout << ++b; // pre increment
b is now 4 and the term ++b is also 4

Output: 4

More details on pre and post increment:

https://www.sololearn.com/discuss/407846/?ref=app