Fortran and C/C++ Hybrid Programming

To ensure successful linking, add an underscore (_) to the names of the global variables and functions in the C code that exchange information in hybrid programming, or use the compilation option -fno-underscoring. Otherwise, a linking error is reported.

Example code:

Fortran main program:
program test
external ctest
 
ii=20
x=200.0
call ctest(ii,x) // Call the C function interface.
 
end
C code:
void ctest_(int *ii,float *x) {
   // Implementation
}