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 Header  files  in  the  program  are  included  before  main ( )  function between < > after writing #include as shown in above examples #include <stdio.h> is written. All header files are present in compiler  if  you  are  using  TurboC  then  you  can  see  this  in  INCLUDE  folder “C:\TurboC++\Disk\TurboC3\INCLUDE” there are so many header files are present this are named along with .h. in chapter header files we will see how to create your own header file.


Examples of header files: stdio.h, conio.h, math.h, graphics.h, string.h, io.h, malloc.h and so on. You don’t need to memorize all header files basically in this book we are going to use only 4-5 header files.
“A header file is  a file with extension .h which contains  C function declarations  and macro 
definitions and to be shared between several source files. “

Let’s see in short some header files:
  1. stdio.h: It means Standard Input Output (stdio) header file in which output function printf () is defined  and  scanf ()  for  getting  input  from  user. Like just  like  that  there  are  so  many functions are defined.
  2. Conio.h: It means Console Input / Output (con Io) header file in which the functions like clrscr() use for clear output screen and getch () to hold output screen up to get one input from keyboard. And getche () to hold output screen after get one input from keyboard.
  3. Math.h: defines mathematical functions like sin (), cosine (), tan (), pow () and so on.
  4. Graphics.h: For graphics functions for antinational functions, there are some functions to draw circle, ellipse, line, rectangle, to colour screen on output screen. We will see this in chapter C Graphics
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