ASSERT

assert ? Abort the program if assertion is false.

#include <assert.h>

void assert (int expression);

assert() prints an error message to standard output and terminates the program by calling abort() if expression is false (i.e., compares equal to zero). This only happens when the macro NDEBUG is undefined.

No value is returned.

ISO9899 (ANSI C)

assert() is implemented as a macro; if the expression tested has side - effects, program behaviour will be different depending on whether NDEBUG is defined. This may create Heisenbugs which go away when debugging is turned on.

exit(3), abort(3)