assert(3X) — sys5



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



NAME
     assert - verify program assertion

USAGE
     #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.  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
     cpp(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
     cpp(1), abort(3C)



























Printed 5/10/85                                          ASSERT-1
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