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assert(3) [bsd man page]

ASSERT(3)						     Library Functions Manual							 ASSERT(3)

assert - program verification SYNOPSIS
#include <assert.h> assert(expression) DESCRIPTION
Assert is a macro that indicates expression is expected to be true at this point in the program. It causes an exit(2) with a diagnostic comment on the standard output when expression is false (0). Compiling with the cc(1) option -DNDEBUG effectively deletes assert from the program. DIAGNOSTICS
`Assertion failed: file f line n.' F is the source file and n the source line number of the assert statement. 7th Edition May 12, 1986 ASSERT(3)

Check Out this Related Man Page

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

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 error and terminates the program by calling abort(3) 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
POSIX.1-2001, C89, C99. In C89, expression is required to be of type int and undefined behavior results if it is not, but in C99 it may have any scalar type. BUGS
assert() is implemented as a macro; if the expression tested has side-effects, program behavior will be different depending on whether NDE- BUG is defined. This may create Heisenbugs which go away when debugging is turned on. SEE ALSO
abort(3), assert_perror(3), exit(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at GNU
2002-08-25 ASSERT(3)
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