C Hello World

Hello World

Probably the first line of text that everyone prints out on the console when one begins his/her remarkable journey of this endless programming world.

To write on the console you can use the function printf() contained in the library include <stdio.h>

#include <stdio.h> /* Any text in between these two characters is a block comment. Block comments, unlike inline comments, can span multiple lines. Comments are ignored by the compiler and will not be executed. */ int main(void) { printf("Hello, World\n"); // text after two slashes '/' are called inline comments. return 0; }


  1. The #include <stdio.h> is a preprocessor directive. This directive tells preprocessor to include the contents of stdio.h (standard input and output) file in this file.
  2. The stdio.h file contains functions such as scanf() and printf() to take input and display output respectively.
  3. If you use printf() function without writing #include <stdio.h>, the compiler will generate an error during compliation of the program.
  4. The execution of a C program starts from the main() function. We write int before it to specify that the program returns a integer value.
  5. The printf() is a library function to send formatted output to the standard output stream, most commoly the screen. In this program, the printf() displays Hello, World! text on the screen.
  6. \n is used here to take the cursor to the next line. Hence, if we print anything after this command, it will be printed on a new line.
  7. The return 0; statement is the “Exit code” of the program. In simple terms, the program ends with this statement or it signifies that function does not return any value.


Hello, World!

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.

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