Examlex
Amazon.com uses __________ to compare each user's purchases with the purchases of other users with similar preferences to create a list of purchase recommendations. Based on a customer's desire to purchase an author's e-book for her Kindle, Amazon might recommend an e-book by a similar author within the same genre.
NULL Pointer
A pointer that does not point to any object or function, effectively representing the absence of a value or a null reference.
Sentinel
A special value used in programming to indicate the end of a data structure, such as an array or list.
Indirection Operator
The '*' operator in C and C++, used to access the value at the address pointed to by a pointer variable.
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