Why EOF is used in C?

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1. #value
2. #several
3. #returned
4. #functions
5. #expands
6. #input
7. #negative
8. #expression
9. #which
10. #signals
11. #integer
12. #windows
13. #macro
14. #stdio
15. #linux
16. #usually
17. #defined
18. #stream
19. #indicate
20. #constant