My circular calculator goes wrong

Question

I can't find the error
https://code.sololearn.com/c7P37Wwh6QAf/?ref=app

Answer 1

You have an invisible character between printf and (
printf (
^

Answer 2

I'm not entirely sure why but I think it has something to do with a special character or something it's not picking up. There's a space between printf and the ( that I deleted and retyped and the program worked after.

Answer 3

ChaoticDawg
Oh,I got it.
Now I fix it.
Thank you.