C Program Header Files..

1. <stdio.h>: input and
output function in
program.
2. <conio.h>: to clear
screen and pause
information function.
3. <ctype.h>: function for
testing characters
4. <string.h>: function
for manipulating string
5. <math.h>:
mathmatical function
6. <stdlib.h>: utility
function for number,
conversion, storage
allocation
7. <assert.h>: function
that can beused to add
diagnostics to a program
8. <stdarg.h>: function
that can be used to step
through a list of function
arguments
9. <setjmp.h>: function
that can be used to avoid
the normal call and
return sequence

10. <signal.h>: function
for handling exceptional
condition that may arise
in a program
11. <time.h>: function for
manipulating date and
time
12. <limits.h>: constant
definitions for the size of
C data types
13. <float.h>: definitions
relating to floating-point
arithmetic..