### Question 20.25

How can I call FORTRAN (C++, BASIC, Pascal, Ada, LISP) functions from C? (And vice versa?)

The answer is entirely dependent on the machine and the specific calling sequences of the various compilers in use, and may not be possible at all. Read your compiler documentation very carefully; sometimes there is a ``mixed-language programming guide,'' although the techniques for passing arguments and ensuring correct run-time startup are often arcane. More information may be found in FORT.gz by Glenn Geers, available via anonymous ftp from suphys.physics.su.oz.au in the src directory.

cfortran.h, a C header file, simplifies C/FORTRAN interfacing on many popular machines. It is available via anonymous ftp from zebra.desy.de (131.169.2.244).

In C++, a `"C"` modifier in an external function declaration indicates that the function is to be called using C calling conventions.

References: H&S Sec. 4.9.8 pp. 106-7

Read sequentially: prev next up top

This page by Steve Summit // Copyright 1995 // mail feedback