assert(3X)                                             assert(3X)



NAME
     assert - verify program assertion

SYNOPSIS
     #include <assert.h>

     assert(expression)
     int expression;

DESCRIPTION
     This macro is useful for putting diagnostics into programs.
     If expression is false (zero) when assert is executed,
     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 is 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, stops assertions
     from being compiled into the program.

NOTES
     assert cannot be used in an expression since it turns into
     an if statement.

SEE ALSO
     abort(3C)

     cpp(1) in A/UX Command Reference






















January 1992                                                    1