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An integer variable containing an address in memory, ie "pointing" to it. Some ProgrammingLanguages even permit you to do [Pointer] arithmetics. Fiddling with [Pointer]s is a very error prone task. Therefor, [Pointer] arithmetic is nowadays frowned upon unless you are doing low level systems programming. [Pointer]s also break type safety. Many ProgrammingLanguages attempt to alleviate this by requiring you to use a different type of [Pointer] for each kind of DataType you want to point to. Nowadays, if you aren't writing a kernel or hardware driver, you should be using a ProgrammingLanguage that has a GarbageCollector and frees you from the arduous task of keeping track of your memory.
6 pages link to
Pointer
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Stack
NullPointer
NULL
ProgramCounter
AddressSpace
DataType