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I have three functions
(cm_angles, bh_cros_section, and int_part) which are in C++, and I need to call them in a FORTRAN program.
I have created shared libraries of these functions
and linked with FORTRAN program, and
in FORTRAN program I made a call e.g. "call cm_angles(arg1, arg2, ...)".
From the first sight these functions work correct,
and calculated values are correct also, but the
function int_part (only int_part), causes a problem.
The problem is:
after the first call of int_part, the call of random number
generator function (ranmar) in FORTRAN gives "NAN".
Without calling int_part ranmar works well.
If anyone want to look, the int_part and it's header file are attached.
The FORTRAN code consist of many files, and is
complicated, therefor I didn't attach it.
the type of int_part function was double.
I am not sure exactly why, but in order to
implement the function in FORTRAN, the type should be void.
I have changed it to void, and it worked.
No problem. With g++, if you compile with -Wall (to enable all warnings), you'll get a warning for your situation. I think there's an option to make warnings become errors (so that compilation fails), but I don't remember what it is.
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