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Welcome back.

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In this video, what I'm going to do is I'm going to build and run a sample C++ program using Visual

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Studio code.

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First thing we need to do is we need to create a folder.

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That folder is going to hold our projects.

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We're going to have more than one project, which makes life a lot simpler.

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Most of the ways that you see Visual Studio code set up on the Web is basically just one project and

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one project at a time, and that's okay.

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But it becomes really tedious for a course like this where we've got a lot of little projects and we're

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learning a lot as we go.

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It's much more efficient just to create one folder that holds a bunch of projects for each section of

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the course.

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So first thing we're going to do is we're going to create that folder.

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Then what we're going to do is we're going to write a really small C++ program that we'll be able to

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test easily.

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Then we'll configure Visual Studio code to build and run that.

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So first order of business is to create that folder.

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Now I don't create the folder within Visual Studio code.

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I just do it right in the file system.

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So I'm just going to minimize this for a minute and I'm going to go to my desktop and I'm going to create

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a folder here and I'm just going to call this section X.

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Let's say you can organize your folders however you like.

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Section one, section two, section three of the course.

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Section X is what I'm going to use to represent any section that you might be working on.

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So that's it.

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It's just an empty folder.

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There's nothing in it.

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We're going to create subfolders within it.

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Each sub folder will be a different project, but we'll do that part in Visual Studio code.

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So let me come back to Visual Studio code.

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And now what I want to do is I want to open the folder.

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I can do it right here.

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I can also use these command keys.

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And I can also come up to here where it says File, open folder, select the desktop.

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So now what I'll do is I select the desktop and I'll select section X and I'll select the folder down

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here.

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And now what happens is Visual Studio code is opened up the section x folder.

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There's nothing in it.

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It's just an empty folder right now.

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And we can create new files and open files and so forth.

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Now, what I'm going to do is I'm going to close this down right here just so we don't clutter anything

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up.

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And the first thing I want to do is I'm going to create a sub folder within this section, x folder,

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and we can do that by clicking that icon right there, new folder.

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This creates a new file, this creates a new folder.

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So that's what we're going to do.

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And I'm going to call it Project one.

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We can create multiple projects and I'll show you how to do that a little bit.

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And then within Project one.

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So we want to be sure that Project one is selected, we're going to create a new file and that new file

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is main DHCP.

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That's our main C++ program.

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This is that little test program that we're going to write.

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So I can just select that and we're going to get this message down here.

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Do you want to use the insiders version that allows you to use new features in Visual Studio code that

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maybe aren't ready for prime time yet?

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They're still being worked out, or at least candidates and so forth.

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I'm just going to say no, I want to use the stable version.

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And now what we're going to do here is we're going to write a really simple C++ program so that we can

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configure it to run.

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So let me show you how to do that.

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A lot of this you won't know yet, especially if you're just starting out the course, but just type

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along, follow along, and all this will be explained during the course.

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So I'm going to say using namespace C CD and now we're going to create an INT Main, that's our main

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function.

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And then we're going to say here is C out hello from Project one.

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Just so we know that if that displays, our program is running correctly.

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All right.

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As I said, all this will be explained.

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So don't worry about it.

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If you don't understand the syntax, that's that's perfectly normal.

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Okay.

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Now, so we've got this program that we want to run and it is in Project one folder, which is in the

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section x route folder.

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Perfect.

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It's very important now that we always select the file that we want to run.

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We may have multiple projects with multiple main CP files, Visual Studio code runs, the active one,

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which is the one that's selected.

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So it's really important that we select it.

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Now before we run it, we need to do some configuration so we can come up here to view command palette

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or press control shift.

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P And what we're going to do here is we're just going to type C plus plus and somewhere in here you're

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going to get an edit configurations UI.

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That's what we need to do.

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That's going to configure the Visual Studio code, IntelliSense, which is a real nice feature.

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As we type our code, it's going to try to help us figure out what errors we might have and so forth.

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So I'll show you how to do that.

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We just select that and we're going to come right into here, IntelliSense configurations and most of

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these we're not going to mess with this compiler right here.

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Notice that it's already figured out that I'm using the GW 64 compiler.

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That GCC, though, is not the one we want.

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We want the GCC plus plus that guy right there.

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We may have other compilers on the system as well, but this is the one I want to use the GW.

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So make sure that that's c g plus plus.

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Now GCC TCC is the C compiler.

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Someone else scroll down just a little bit more and then right here for the C++ standard, you can use

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14 or 17.

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I'm just going to use C++ 17.

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That tells IntelliSense to use that standard when it's looking through the code.

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That's it.

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So you can press control s to save.

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And our IntelliSense now is configured.

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You'll notice what happened over here on the left side, a dot vs code folder was created and if you

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expand that, it created a CP Properties JSON file.

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That's a configuration file that has all that stuff that we just said.

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So we're almost done.

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Not quite.

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What we need to do now is we need to configure a build test and I'll show you how that works.

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You can come up here to terminal and configure default build task right here, select that.

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Now it's going to ask us what compiler do you want to use?

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And we may get a lot of different compilers depending on what's installed on your system.

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It's important that you use min GW 64 G Plus Plus.

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This guy right here, don't use this.

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That's a preprocessor.

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Don't use this.

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That's the C compiler.

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Make sure we're using some kind of G plus plus or C++ something in there.

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If you're using Min GW 64, this is what it's going to be.

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It might be installed in a different place, but you're going to see the min GW 60 for the g plus plus.

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That's what I'm going to select.

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Okay.

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So notice now what happened.

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It created a tasks JSON configuration file.

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So we need to make a few changes here, right here on line nine, right after line nine, I'm going

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to add a few command line switches.

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One is dash capital W, a LX lowercase followed by a comma that tells the C++ compiler to generate warnings,

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all warnings that it can.

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Then I'm going to press enter and again I'm going to use some quote marks and I would say dash speed

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equals C plus plus 17 and a comma at the end that tells the build to use the C++ 17 compiler.

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Now there's one more thing we need to do right here where it says file directory name.

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We want to copy that and put it right in here.

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So we're going to replace file with file directory name.

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So I'm just going to paste it right in there so I don't have any typos.

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And then right at the end of that, right between the curly and the quote, I'm just going to do a slash

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slash start.

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CP And that tells the build system to compile all the C++ files that it sees in the project.

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One of the problems with Visual Studio code as it comes configured, it only builds the one single C++

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file.

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So when students write larger programs that have multiple C++ files, they have errors because they

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can't build multiple C++ files.

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So that's it.

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That takes care of this.

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I'm going to save this and I'm going to get out of here.

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So now I'm right back to here.

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So what I want to do next is I want to build this program that means compile it and Lincoln.

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So I'm going to come up to terminal and I'm going to say.

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Run Build Task Control Shift B.

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Now when I do that, we'll get some stuff going on down here and notice it says Build Finish successfully

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and you'll also see that w a LL and the standard C++ 17, all those compiler flags that we put in the

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tests, JSON file, this is where they're being used.

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There's the star CP that we changed.

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So basically it's compiling everything in that project one folder and creating a file called Main XY.

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That's our executable file.

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That's the one we can run.

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And you can see it right over here.

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There it is.

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Now, what we can do is we can run that executable.

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So I'm going to right click on that executable and open it in the integrated terminal.

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And you can see that it's opened up a command prompt right in that project one directory and that's

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exactly where Main EFC is.

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So if I type LHS, that just gives us a file listing and we can see that we've got our main CP and R

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may not EFC.

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So what we want to do now is we want to run the main XY program so we can do a dot slash, may dot XY

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and press enter.

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And there it is.

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Hello from Project one.

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Simple as that.

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So notice what we did.

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We built the program.

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And by the way, these configurations that we've done, we're done with that.

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We don't have to do that again.

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We can create new projects.

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We can create new FTP files within those projects.

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These configurations will apply to all of them.

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So let me show you how to do that.

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Let me close this down.

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Let's create another project, project two.

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So if I click over here and I select that guy now, it's going to create the folder within Project one.

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That's not what I want.

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I want Project two to be at the same level as Project one.

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And at first you're thinking, how do we how do I do that?

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I know, I remember.

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I couldn't figure it out.

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The way you do it is when you press this, you click Main CP, for example, and you press escape and

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notice this blue box that just showed up.

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It's not really intuitive that you need to press escape there, but that's what works.

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Now we can come over here and create a new folder and we're going to call it Project two.

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And notice now that Project one and Project two are at the same level, which is what we want.

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So I'm just going to copy Project one, so I'm just going to copy and paste and I'm going to come over

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here to Project two and I'm going to create a marked HTTP just like we did before, and I'm just going

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to copy that.

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So I don't have to type it all in again.

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I'm just going to say hello from Project two.

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That's it.

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So now what do we want to do?

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We want to run Project two.

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So remember, it has to be the active file.

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So you want to make sure that you are clicking here.

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Right.

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And then what we're going to do is we're going to go to terminal control shift B or build task.

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I tend to just do control shift B, but I'll do it this way here so you can see exactly what I'm doing.

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So run, build task.

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It is going to compile and build project t c right over here where my mouse is.

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And it created another main gun file.

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If I want to run that, I can right click on it.

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Open an integrated terminal and do a dot slash main.

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See hello from Project two.

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So this is how we can create as many projects as we want.

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It's really easy and it's really convenient because sometimes when we're learning, we're trying different

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projects out, so that's pretty much it.

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We can also, when we run the program, we can grab input from the user.

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So if I wanted to change this project to right here, I could always say, let's see it num.

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And then we're going to say something like See out, enter your favorite number

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and then we'll read that from the user into NUM and then we'll just display see out your favorite number

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is what they just entered, right?

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No, we will put a new line at the end.

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So this program now has input and output.

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And remember, I can't just run it again because I have to rebuild it if I run Main XY.

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Let me show you how that works.

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It'll just go run the previous one, right?

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Because I haven't built it again.

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So I have to come up to terminal.

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Build active.

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There we go.

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Now, I can run this mainly because it's been rebuilt and I can run that.

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And it's going to say, enter your favorite number and I want to enter 100.

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Your favorite number is 100.

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And I could have put a space right in here or something like that and a colon just to prompt the user

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in a little prettier way.

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So that's it.

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This is how we can build and run our C++ programs.

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In the next video, what we'll do is we'll create one more configuration file called Launch JSON.

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And what that's going to do is it's going to allow us to use the debugger so that we can walk through

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code and debug code, especially code that's really tricky or it's given us problems or we're trying

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to find an error and I'll show you how to do that in the next video.