Sample program:

#include<stdio.h>   ///way to comment header file required

int main()  ///main function

{ 

         printf("Hello world");  //// print message on screen 

return 0;

 }

 

Explanation:

First line is necessary , it is header file to be included for functions like printf.

Second line is main function   .Every C program starts from here .So fixed line in a program.

line 3: { this denotes a block will start from here. Just your task what you need to do will start and } denotes end of the block.

line 4:  this will  display Hello World on your screen.

return 0 : compulsory line , we will discuss it later.

line 6: } ends the program.