How does comma operator work during assignment?

Question

int a = 1;
int b = (1,2,3);
cout << a+b << endl; // this prints 4

1. Is (1,2,3) some sort of structure in c++ (some pri

Answer 1

it probably used to be b = foo(1,2,3) but the foo got deleted accidentally. C doesn't complain about this kind of crap "it's a feature".