ASSERT(3V)             C LIBRARY FUNCTIONS             ASSERT(3V)

NAME
     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.  If expression is
     false (0), it displays a diagnostic message on the  standard
     output  and exits (see exit(2V)).  Compiling with the cc(1V)
     option -DNDEBUG, or placing the preprocessor control  state-
     ment

          #define NDEBUG

     before the  ``#include  <assert.h>''  statement  effectively
     deletes assert() from the program.

SYSTEM V DESCRIPTION
     The System V version of assert() calls abort(3) rather  than
     exit().

SEE ALSO
     cc(1V), exit(2V), abort(3)

DIAGNOSTICS
     Assertion failed: file f line n
          The expression passed to the assert() statement at line
          n of source file f was false.

SYSTEM V DIAGNOSTICS
     Assertion failed: expression, file f, line n
          The expression passed to the assert() statement at line
          n of source file f was false.