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1.1 The Standard Headers: <assert.h>

The assert macro is used to add diagnostics to programs.

void assert(int expression)

If expression is zero when

          assert(expression)

is executed, the assert macro will print on stderr a message such as

       Assertion failed: expression, file filename, line nnn

It then calls abort to terminate execution.  The source file name and line number come from the preprocessor macros __FILE__ and __LINE__.

If NDEBUG is defined at the time <assert.h> is included, the assert macro is ignored.

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