assert - output diagnostic messages

Syntax

#include <assert.h> void assert(int expression);

Description assert() is implemented as a macro. When it is executed, it checks whether expression

	evaluates to false (0) at a specific position in the program. If an error occurs, assert() writes a comment about the particular call that failed on stderr and calls abort(). The message includes the text of the argument, the name of the source file (__FILE__), and the source file line number (__LINE__).
Notes	assert calls are not executed if NDEBUG is defined. This can be done by the following methods: by specifying a preprocessor option when calling the compiler (see the manuals "C Compiler" [3 (Related publications)] and "C/C++ Compiler" [4 (Related publications)]) by inserting a preprocessor control statement #define NDEBUG in the source program before the #include <assert.h> statement.
See also	abort(), __FILE__, __LINE__, stderr(), assert.h.