KNOW:
BE ABLE TO:
Sample Exam Question:
Implement the following function:
int everyNodeIsx (struct listNode* head, int x);
/* Precondition: head is the head pointer of a
** non-empty linked list.
** Postcondition: The return value is 1 (true) if every node in the
** list contains x in the data part. Otherwise, the return value
** is 0 (false).
*/