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C++ Primer, Fifth Edition by Barbara E. Moo, Josée Lajoie, Stanley B. Lippman

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2.3.2. Pointers

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A pointer is a compound type that “points to” another type. Like references, pointers are used for indirect access to other objects. Unlike a reference, a pointer is an object in its own right. Pointers can be assigned and copied; a single pointer can point to several different objects over its lifetime. Unlike a reference, a pointer need not be initialized at the time it is defined. Like other built-in types, pointers defined at block scope have undefined value if they are not initialized.

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Pointers are often hard to understand. ...

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