Question: 7. A circularly-linked list with a header node uses the same declarations as a simple singly-linked list. Write a C++function that returns the length of

7. A circularly-linked list with a header node uses the same declarations as a simple singly-linked list. Write a C++function that returns the length of an ordered list represented by such a structure. This function should be iterative. (Hint: Off-line, sketch a picture.)
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