How it is possible

Question

https://code.sololearn.com/c82xx5WZPj90/?ref=app

Answer 1

#include <iostream>
using namespace std;
int main()
{

int i=0;
i=(++i)+i+(++i);
cout<< i<<endl;
int x=0;
x=(++x)+(++x);
cout<< x<<endl;

return 0;
}

x and I return 4. why????

Answer 2

We can remove the brackets and the result will not change.

Answer 3

how about ++x + ++x + ++x it is 7.