Interlanguage Calling Conventions

You should follow these recommendations when writing C/C++ code to call functions written in other languages:

• Avoid using uppercase letters in identifiers. Fortran and Pascal use only lowercase letters for all external names. Although both fold external identifiers to lowercase by default, the Fortran compiler can be set to distinguish external names by case.
• Avoid using the underscore (_) and dollar sign ($) as the first character in identifiers, to prevent conflict with the naming conventions for the C and C++ language libraries.
• Avoid using long identifier names. The maximum number of significant characters in identifiers is 250 characters.

Corresponding Data Types
Use the Subroutine Linkage Conventions in Interlanguage Calls
Sample Program: C Calling Fortran