# 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