.h extension file is called header file in C.
example: stdio.h, math.h, string.h
Include all header files in top of your program.
Header files contain definition of function and definition of macros.
Header files program you can use directly in your program.
There are two types of header files:
1. In-built header file
2. User define header file
NOTE: "User define header file" you can learn in next chapter. In this chapter you can learn "In-built header file"
#include <header file name with extension >
Example: #include <stdio.h>
without stdio.h header file you can not use bellow functions in your program:
It contains functions for console input/output
some Important conio.h function: clrscr(), getch()
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