* The #include<stdio.h> is a preprocessor command. This command tells compiler to include the contents of stdio.h (standard input and output) file in the program.
* The stdio.h file contains functions such as scanf() and print() to take input and display output respectively.
* If you use printf() function without writing #include<stdio.h>, the program will not be compiled.
* The execution of a C program starts from the main() function.
* The printf() is a library function to send formatted output to the screen. In this program, the printf() displays Hello, World! text on the screen.
* Conventionally, the first ever program you write is the "hello world" program, be it in any language.
* This is because Brian Kernighan was the first to write "hello, world" program for the documentation of the BCPL programming language developed by Martin Richards.