C++Talk.NET C++ language newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Fortran call from C++          C++Talk.NET Forum Index -> C++ language (comp.lang.c++) View previous topic :: View next topic   Author Message Dennis Kernighan Guest Posted: Fri Mar 05, 2004 8:41 am    Post subject: Fortran call from C++ On Microsoft's pages there is an example of making Fortran call from C++, see http://tinyurl.com/2692f . If I put C code in the test.c and Fortran code in FORSUBS.FOR and press F5 in C++, I get following errors: ------- error statement -------- fortrantester error LNK2019: unresolved external symbol "void __stdcall PYTHAGORAS(float,float,float *)" (?PYTHAGORAS@@YGXMMPAM@Z) referenced in function _main fortrantester error LNK2019: unresolved external symbol "int __stdcall FACT(int)" (?FACT@@YGHH@Z) referenced in function _main fortrantester fatal error LNK1120: 2 unresolved externals ------- error statement -------- So. Is the problem that Fortran compiler is missing? Where could I get one and how will I tell to C++ that it should use it? DK Back to top Jeff Schwab Guest Posted: Fri Mar 05, 2004 8:48 am    Post subject: Re: Fortran call from C++ Dennis Kernighan wrote: Quote: On Microsoft's pages there is an example of making Fortran call from C++, see http://tinyurl.com/2692f . If I put C code in the test.c and Fortran code in FORSUBS.FOR and press F5 in C++, I get following errors: ------- error statement -------- fortrantester error LNK2019: unresolved external symbol "void __stdcall PYTHAGORAS(float,float,float *)" (?PYTHAGORAS@@YGXMMPAM@Z) referenced in function _main fortrantester error LNK2019: unresolved external symbol "int __stdcall FACT(int)" (?FACT@@YGHH@Z) referenced in function _main fortrantester fatal error LNK1120: 2 unresolved externals ------- error statement -------- So. Is the problem that Fortran compiler is missing? Where could I get one and how will I tell to C++ that it should use it? DK Wel,, Dennis Kernighan, I don't think the C++ standard attaches any particular, Fortran-related behavior to the pressing of F5... I think you need to try one of the MS support groups, or perhaps even read your linker's documentation. Back to top Charles LaCour Guest Posted: Fri Mar 05, 2004 9:39 pm    Post subject: Re: Fortran call from C++ "Dennis Kernighan" <kernighan (AT) australia (DOT) edu> wrote Quote: On Microsoft's pages there is an example of making Fortran call from C++, see http://tinyurl.com/2692f . If I put C code in the test.c and Fortran code in FORSUBS.FOR and press F5 in C++, I get following errors: Posting some a small executable source file wouldn't hurt. Quote: ------- error statement -------- fortrantester error LNK2019: unresolved external symbol "void __stdcall PYTHAGORAS(float,float,float *)" (?PYTHAGORAS@@YGXMMPAM@Z) referenced in function _main fortrantester error LNK2019: unresolved external symbol "int __stdcall FACT(int)" (?FACT@@YGHH@Z) referenced in function _main fortrantester fatal error LNK1120: 2 unresolved externals ------- error statement -------- So. Is the problem that Fortran compiler is missing? Where could I get one and how will I tell to C++ that it should use it? DK Back to top Gianni Mariani Guest Posted: Fri Mar 05, 2004 9:54 pm    Post subject: Re: Fortran call from C++ Dennis Kernighan wrote: Quote: On Microsoft's pages there is an example of making Fortran call from C++, see http://tinyurl.com/2692f . If I put C code in the test.c and Fortran code in FORSUBS.FOR and press F5 in C++, I get following errors: ------- error statement -------- fortrantester error LNK2019: unresolved external symbol "void __stdcall PYTHAGORAS(float,float,float *)" (?PYTHAGORAS@@YGXMMPAM@Z) referenced in The symbol here "?PYTHAGORAS@@YGXMMPAM@Z" is a C++ mangled name. There is a standard way to tell the C++ compiler to not use "external linkage" - this is by using the ' extern "C" ' syntax. See below. Quote: function _main fortrantester error LNK2019: unresolved external symbol "int __stdcall FACT(int)" (?FACT@@YGHH@Z) referenced in function _main fortrantester fatal error LNK1120: 2 unresolved externals ------- error statement -------- So. Is the problem that Fortran compiler is missing? You'll obciously need fortran libraries, but you don't need a fortran compiler to link with a fortran library. Where could I get Quote: one and how will I tell to C++ that it should use it? ... I'll let you figure this out .. The right way to do this using C++ is below: #include <cstdio> extern "C" { extern int FACT (int n); extern void PYTHAGORAS (float a, float b, float *c); }; main() { float c; std::printf("Factorial of 7 is: %dn", FACT(7)); PYTHAGORAS (30, 40, &c); std::printf("Hypotenuse if sides 30, 40 is: %fn", c); } Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         C++Talk.NET Forum Index -> C++ language (comp.lang.c++) All times are GMT Page 1 of 1   Jump to: Select a forum C/C++----------------C LanguageC Language (Moderated)C++ Language (Moderated)C++ language (comp.lang.c++)C++ language, library and standards Non-English C/C++ Newsgroups----------------C++ (German)C++ (French)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.