Hello World - First Program

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What is Program ?

Program is a set of instructions which can be executed in a specific sequence to get the desired output.

Hello World Program is the First Program- hello.c
Program:

#include <stdio.h> /* Header file */ main()
{ /* Program execution starts here */ printf("Hello world"); /* Built-in function - printf() */ return 0; }

  1.Comments should be enclosed within /* */ and they won’t get executed.
2.Program execution always start from the main function. 3.printf() is a library function available in “stdio.h” header file.
It is used to format and print data. 4.Header file contains the built-in functions and pre-defined variables.

 ALSo
hello.c is the file containing the above program.  Below command is used to compile the c program.

 gcc <C File Name> 
i.e. gcc hello.c

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