Types of header files in C Language

Types of header files in C Language

C programming language helps you to save your time by offering you some standard header files which can easily short your long code and make your programming easy.

C programming language offers 25 standard header files (which is supported by default). If the programs are complex and lengthy , they can be modularized into subprograms called functions, a group of this functions make up a header file.

C programming language has 25 standard header files which are as follows:

1. #include<stdio.h> (Standard input-output header)
   Used to perform input and output operations in C like scanf() and printf().
2. #include<string.h> (String header)
   Perform string manipulation operations like strlen and strcpy.
3. #include<conio.h> (Console input-output header)
   Perform console input and console output operations like clrscr() to clear the screen and getch() to get the character from the keyboard.
4. #include<stdlib.h> (Standard library header)
   Perform standard utility functions like dynamic memory allocation, using functions such as malloc() and calloc().
5. #include<math.h> (Math header )
   Perform mathematical operations like sqrt() and pow(). To obtain the square root and the power of a number respectively.
6. #include<ctype.h>(Character type header)
   Perform character type functions like isaplha() and isdigit(). To find whether the given character is an alphabet or a digit respectively.
7. #include<time.h>(Time header)
   Perform functions related to date and time like setdate() and getdate(). To modify the system date and get the CPU time respectively.
8. #include<assert.h> (Assertion header)
   It is used in program assertion functions like assert(). To get an integer data type in C/C++ as a parameter which prints stderr only if the parameter passed is 0.
9. #include<locale.h> (Localization header)
   Perform localization functions like setlocale() and localeconv(). To set locale and get locale conventions respectively.
10. #include<signal.h> (Signal header)
    Perform signal handling functions like signal() and raise(). To install signal handler and to raise the signal in the program respectively
11. #include<setjmp.h> (Jump header) - Perform jump functions.
12. #include<stdarg.h> (Standard argument header)
    Perform standard argument functions like va_start and va_arg(). To indicate start of the variable-length argument list and to fetch the arguments from the variable-length argument list in the program respectively.
13. #include<errno.h> (Error handling header)
    Used to perform error handling operations like errno(). To indicate errors in the program by initially assigning the value of this function to 0 and then later changing it to indicate errors.
14. <complex.h> - Complex number arithmetic
15. <fenv.h> - Floating-point environment
16. <float.h> - Limits of floating-point types
17. <inttypes.h> - Format conversion of integer types
18. <iso646.h> - Alternative operator spellings
19. <limits.h>- Ranges of integer types
20. <setjmp.h>- Nonlocal jumps
21. <signal.h> - Signal handling
22. <stdalign.h> - alignas and alignof convenience macros
23. <uchar.h> - UTF-16 and UTF-32 character utilities
24. <wchar.h> - Extended multibyte and wide character utilities
25. <wctype.h> - Functions to determine the type contained in wide character data