... The types of arguments which may be passed from one routine to the other, whether the called routines are written in C or Fortran, are: Fortran C ----------------- ------ CHARACTER fchar COMPLEX complex DOUBLE PRECISION double INTEGER fint LOGICAL bool REAL float The non-C types in this table are all defined in include file gipsyc.h , so each C program or function must include this file (after the standard C include files but before the definition files). ... INTEGER II(..) fint ii_c(.. ...