 Hi again, in this lesson we are going to talk about that how to write your first C program or how to write Hello World in C language. First what we need to do is to open new source file into our DevC++ IDE, then we need to import or include our standard input and output library, which is located on our computer in a file stdo.h. stdo means that this library is for standard input and output and h extension means that this file is header. So our file stdo.h is included into our program, in this file we have a lot of functions to help us to print some text to the command line or to get some text from the command line and not just from the command line, but for example from some files and so on. Every C program needs to have main function, so we are going to write our main function followed by pair of parenthesis and pair of square brackets. Inside these square brackets we are going to write our code. We need to write one statement, which is going to tell to our program that we want to print some text to our command line. So we are going to use function printf, this function is function from stdo.h and this function will help to us to print our text to the screen. Next that we want to print on the screen, we are going to put it here between double quotes. We want to put text hello world and exclamation mark and after every statement in C programming language we need to put at the end semicolon, okay. Now let's save our first program hello world, let's call it hello world dot c, let's save it as csource file, then let's compile it and finally let's run it. And as you can see we have printed the result hello world, that's all in this lesson, thanks for watching, bye bye.