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NULL

A pointer can be assigned the value 0 to explicitly represent that it does not currently

have a pointee. Having a standard representation for "no current pointee" turns out to be

very handy when using pointers. The constant NULL is defined to be 0 and is typically

used when setting a pointer to NULL. Since it is just 0, a NULL pointer will behave like

a boolean false when used in a boolean context. Dereferencing a NULL pointer is an error

which, if you are lucky, the computer will detect at runtime -- whether the computer

detects this depends on the operating system.

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