I could not understand this question

Hi, The below shows the thrid question of my exam which i did not answer as i could not understand the question. Could anyone make me understand this question and help me to find the solution for this.....

I can only assume that understanding the question is not a problem for you, because it works exactly like a fill in the blank question. I know you have encountered these before.

Now that you have actually taken the test you are free to look up the answer:

Originally Posted by man fputwc

RETURN VALUES
The fputwc(), putwc(), and putwchar() functions return the wide character
written. If an error occurs, the value WEOF is returned.

Since this is true, we've narrowed it down to two possible answers.
Now if you know what errno.h contains, you can discern what happens to the global errno.

Why do I get the feeling that you're just copy/pasting every question from your online exam?
Oh that's right, its
Need to find the solution for the Macro
Need solution....

You post your answer, and perhaps the reason why you think that is the answer.

Us simply telling you, then you filling in the tick box doesn't solve anything.

If you really are getting stuck on questions, my adivse is to re-read what you have already completed and learn from your own experience. Like Salem said, waiting for people to spoon-feed you the answer is going to do nothing for your confidence when you sit a major computer science exam at a later date.

People can help you to a certain extent, but it is all down to you to learn and decide what the best possible outcome will be