assert(3X)                       DG/UX 5.4.2                      assert(3X)


NAME
       assert - verify program assertion

SYNOPSIS
       #include <assert.h>

       void assert (int expression);

DESCRIPTION
       This macro is useful for putting diagnostics into programs.  When it
       is executed, if expression is false (zero), assert prints

              Assertion failed: expression, file xyz, line nnn

       on the standard error output and aborts.  In the error message, xyz
       is the name of the source file and nnn the source line number of the
       assert statement.  The latter are respectively the values of the
       preprocessor macros FILE and LINE.

       Compiling with the preprocessor option -DNDEBUG [see cc(1) or
       cpp(1)], or with the preprocessor control statement

       #define NDEBUG

       ahead of the

       #include <assert.h>

       statement will stop assertions from being compiled into the program.

SEE ALSO
       cc(1), cpp(1), abort(3C).

NOTES
       Since assert is implemented as a macro, the expression may not
       contain any string literals.





















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