The ANSI/ISO/IEC spec for C specifies the following types _Bool float _Complex double _Complex long double _Complex I believe that we should update our list of MPI C types and their correspondance to C types to reflect this Marc Snir IBM T.J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598 Tel: 914-945-3204 (8-862-3204) Fax: 914-945-4425 (8-862-4425) URL: http://www.research.ibm.com/people/s/snir