How can i write this statement without using the '?' (question mark) in C++ ? sum = carry + (node1 ? node1->data : 0) + (node2 ? node2->data : 0)

Question

node1 and node2 are nodes of a linked list.

Node* node1, Node* node2;
int carry = 0;
int sum;
sum = carry + (node1 ? node1->data : 0) + (node2 ? node2->