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The following macros are often ubiquitously used in C and thus C++ as well:
* <code>NULL</code> (expands to <code>(void*)0</code>, used prior to the introduction of <code>nullptr</code> to represent a null pointer)
* <code>NDEBUG</code> (a macro meaning "no-debug", used primarily to control whether <code>assert()</code> calls are ignored)
* <code>assert()</code> (a macro with arguments, which terminates the program if the argument evaluates to <code>false</code>, <code>0</code>, or <code>nullptr</code>, and can be disabled by <code>NDEBUG</code>)
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