Header Files-:

Header Files

•A header file is a file with extension [.h ] which contains C function declarations and macro      definitions to be shared between several source files.
•There are two types of header files: the files that the programmer writes and the files that comes with your compiler.
•Commonly used are:stdio.h,conio.h, math.h, stdlib.h, float.h etc.

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Most Common Header files Used in the C program and there functions are as follow-:
List of inbuilt C functions in stdio.h file:-

1. printf()-: This function is used to print the character, string, float, integer, octal and hexadecimal values onto the output screen
2. scanf()-: This function is used to read a character, string, numeric data from keyboard.
3. getc()-: It reads character from file
4. gets()-: It reads line from keyboard
5. getchar()-: It reads character from keyboard
6. puts()-: It writes line to o/p screen
7. putchar()-: It writes a character to screen
8. clearerr()-: This function clears the error indicators
9. f open()-: All file handling functions are defined in stdio.h header file
10. f close()-: closes an opened file
11. getw()-: reads an integer from file
12. putw()-: writes an integer to file
13. f getc()-: reads a character from file
14. putc()-: writes a character to file
15. f putc()-: writes a character to file
16. f gets()-: reads string from a file, one line at a time
17. f puts()-: writes string to a file
18. f eof()-: finds end of file
19. f getchar()-: reads a character from keyboard
20. f getc()-: reads a character from file
21. f printf()-: writes formatted data to a file
22. f scanf()-: reads formatted data from a file
23. f putchar()-: writes a character from keyboard
24. f seek()-: moves file pointer position to given location
25. SEEK_SET() -:moves file pointer position to the beginning of the file
26. SEEK_CUR()-: moves file pointer position to given location
27. SEEK_END()-: moves file pointer position to the end of file.
28. f tell()-: gives current position of file pointer
29. rewind()-: moves file pointer position to the beginning of the file
30. putc()-: writes a character to file
31. sprint()-: writes formatted output to string
32. sscanf()-: Reads formatted input from a string
33. remove()-: deletes a file
34. fflush() flushes a file

List of inbuilt C functions in conio.h file:-

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