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RedHat 9 (Linux i386) - man page for assert (redhat section 3)

ASSERT(3)			    Linux Programmer's Manual				ASSERT(3)

NAME
       assert - abort the program if assertion is false

SYNOPSIS
       #include <assert.h>

       void assert(scalar expression);

DESCRIPTION
       If  the	macro  NDEBUG  was  defined at the moment <assert.h> was last included, the macro
       assert() generates no code, and hence does nothing at all.  Otherwise, the macro  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).

       The purpose of this macro is to help the programmer find bugs in his program. The  message
       "assertion  failed  in file foo.c, function do_bar(), line 1287" is of no help at all to a
       user.

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 be-
       haviour will be different depending on whether NDEBUG is defined.  This may create Heisen-
       bugs which go away when debugging is turned on.

SEE ALSO
       exit(3), abort(3), assert_perror(3)

C99					    2002-08-25					ASSERT(3)


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