Problems with Increment Operator

Question

How would we predict the following outputs:

#include <iostream>

int main()
{
int a = 1;
std::cout << ++a + ++a + ++a << "\n";
a = 1;
std::cout << ++a + a++ + a++ << "\n";
a = 1;
std::cout << a++ + ++a + ++a;

return 0;
}

Can you please explain why and when each increment takes place.

Answer 1

value will assign from left to right.

Answer 2

9
7
8