ultrix man page for assert

assert(3)						     Library Functions Manual							 assert(3)

Name
       assert - program verification

Syntax
       #include <assert.h>

       assert(expression)

Description
       The macro indicates expression is expected to be true at this point in the program.  It causes an with a diagnostic comment on the standard
       error when expression is false (0).  Compiling with the option -DNDEBUG effectively deletes from the program.

Diagnostics
       `Assertion failed: a, file f n'.  The a is the assertion that failed; f is the source file and n the source line number of the statement.

																	 assert(3)