The link field in the last node in a linked list has a special value stored in it. What is it? It has a special name. What is the special name? Why is this done?
What will be an ideal response?
The value is the null pointer. (Not the NULL pointer.) The null pointer value
is used to signal the end of the linked list. It is obtained by assigning the value 0 to a pointer variable. When a pointer is assigned the value 0, the C++ type system
converts the int value 0 to the implementation dependent value of the null pointer.
C++ provides a special preprocessor symbol, NULL, which evaluates to the int
value 0 for this use. In C, the value of NULL was an actual pointer value. In C++, the
value of NULL is just 0. The bit pattern for the null pointer is not required to be all
0s.
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