assert - Abort the program if assertion is false.


SYNOPSIS

       #include <assert.h>

       void assert (int expression);


DESCRIPTION

       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 was undefined  when  <assert.h>  was
       last included.


RETURN VALUE

       No value is returned.


CONFORMING TO

       ISO9899  (ANSI  C).   In  the 1990 standard, expression is
       required to be of type int and undefined behavior  results
       if  it  is  not,  but in the 1999 standard it may have any
       scalar type.


BUGS

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


SEE ALSO

       exit(3), abort(3)