In this section:
The following text assumes that you are writing in Silverfrost C/C++ and are calling an FTN95 relocatable binary library (RLB) or dynamic link library (DLL).
When calling FTN95 routines from C/C++, the following major points should be considered:
• Fortran arguments are passed by reference rather than value.
• All Fortran external names are upper case (regardless of the case of the original source text).
• Fortran character variables have no simple analogue in C/C++.
If you have a C/C++ main program calling a Fortran RLB, then the main program should call the library initialisation routine if there is one. Failure to do so will result in unpredictable behaviour. If you are calling a DLL then the initialisation will probably take place automatically when the DLL is loaded.
For a practical example of how to call an FTN95 DLL from a Visual C++ program see the following topic, which includes example source code.