I see.

Where can I see how g is defined?

I apologize for the questions I ask. But I am trying to learn C, I feel that I am progressing.

But I cannot understand the codes, if I cannot see how the codes are written and how are they defined. Part of understanding the codes is to read through the logic, and I have failed to see the logic, because I cannot read it.

Is there any reference available, where can I read the definitions?

Once again, I thank you for your response