What will be the output and how??

Question

#include<iostream>
int main(){
int a=10;
cout<<a<<a++<<++a;
return 0;
}

Answer 1

Output:
101012

First step: prints 'a' so basically it's '10'
Second step: prints 'a' and after that increases it by 1 so it prints '10' too
Third step: increases 'a' by 1, then prints 'a', but now a is 12