ASSERT(3X)               DOMAIN/IX SYS5                ASSERT(3X)



NAME
     assert - verify program assertion

USAGE
     #include <stdio.h>
     #include <assert.h>

     assert(expression)
     int expression;


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

       "Assertion failed: expression, file xyz, line nnn"

     on the standard error output, then aborts the program.  In
     the error message, xyz is the name of the source file and
     nnn the source line number of the assert statement.

     Compiling with the preprocessor option -DNDEBUG (see cc(1)),
     or with the preprocessor control statement "#define NDEBUG"
     ahead of the "#include <assert.h>" statement, will keep the
     compiler from compiling assertions into the program.

RELATED INFORMATION
     cc(1), abort(3C)
























Printed 12/4/86                                          ASSERT-1