Usage of Common “Header files” in C programming

 Each of these header files serves a specific purpose in a C program:

1. stdio.h: This header file stands for "standard input-output header" and provides functions for input and output operations such as printf() and scanf().
2. stdlib.h: It stands for "standard library" and provides functions such as memory allocation (malloc(), calloc(), free()), random number generation (rand(), srand()), and other utility functions.
3. string.h: This header file provides functions for manipulating strings such as strcpy(), strcat(), strlen(), etc.
4. conio.h: This header file provides functions mainly for console input and output operations in DOS and Windows environments. Functions like getch() and clrscr() are included in this header file. However, note that it's not a standard C library and is often not available in many modern compilers or platforms.
5. time.h: This header file provides functions to work with date and time. Functions like time(), ctime(), difftime() are included in this header file.
6. math.h: This header file provides mathematical functions like sin(), cos(), sqrt(), etc., for mathematical calculations.

The inclusion of these header files allows you to use the functions declared in them within your C program. Each header file provides a set of functions and macros that serve specific purposes, thus making it easier for developers to perform various tasks within their programs.