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Thank you very much for your answer. I don't know why I missed your previous reply. Now the program returns 5. Thank you for your help.

Wish you a merry Christmas and a happy new year.

Hong

Do you mean the zero? I do not know neither.

Thank you very much Paul.

Best,
Hong

You are right. '5' is from the value of C. Then I am really confused. Why z=0?

Thank you Paul.

It prints '5' on the third row in the pic.

Best,
Hong

Hi all, I need to call a function written in Fortran from C for recent work. Because I have no such experience before, I start with a toy program as follows.

However when it runs, there is a '0'...