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09/03/30 10:33:19
>>670
NULL ‚Í cstddef ‚̂ق©‚É cstring, ctime, cwchar, clocale, cstdio ‚Å‚à’è‹`‚³‚ê‚邱‚Æ‚É
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C.2.2.4 Macro NULL ‚æ‚è
> The macro NULL, defined in any of <clocale>, <cstddef>, <cstdio>, <cstdlib>, <cstring>, <ctime>, or
> <cwchar>, is an implementation-defined C++ null pointer constant in this International Standard.


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