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In this video, we'll take our first program,

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which we've compiled to show that it's got no errors and we'll build it.

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Now if you recall building means

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compiling, linking together with extra libraries

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and external files if we need to and creating an executable file.

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That's what building is all about.

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There are several steps involved with building.

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The first one obviously is compiling.

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If we can't get a clean compile, then there's no way we're going to build the system.

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So we want to be able to compile and then link

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to create the exe file. Finally, we can run our executable.

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So in this case, you'll notice here's the source code.

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And there's a lot of space in here. Normally, we don't have all this space in here.

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I just put it in because it makes a little bit easier for you to read

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when you're first learning. So let's just keep it like that.

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This program is exactly the same as it was before.

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We're entering -- we're asking the user to enter their favorite number between 1 and 100.

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We're getting that number and storing it in a variable called favorite number.

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And then we're just saying amazing that's my favorite number too. So it's really really simple program.

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And we've already compiled it.

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There's a couple of ways to compile.

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One is you can come to the source file itself, right click,

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compile or you can come up to build,

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compile current file

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and that's only taking care of the compilation.

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There's also a lot of things you could do at the project level right here. So if I select the project

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and right click, you can see that it says build,

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rebuild, clean, stop build and so forth.

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Let's talk about clean first.

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think about this. When I compile

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a c++ program, I'm converting the cpp source code,

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this source code you see here, to an object format, right. A machine

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language or a binary format.

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That's going to create a .o file or a .obj file, as we mentioned in

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previous lectures.

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That's the purpose of compiling.

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Now as your programs are compiled,

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they will have many of these .object files.

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The clean process removes all those object files

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and puts your project in a clean state.

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In other words source code only. No object files.

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Now why is this important.

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It's important because when you compile your programs

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and build your programs,

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sometimes you want to do a clean build.

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What that means is I want to start from a

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position where nothing has been built. I just want to clean everything out.

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Now when we're working with a single cpp file like here,

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it's pretty much a moot point because it's just one file.

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But typically, c++ programs are very large

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and you've got a lot of c++ files.

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Each one of them is being compiled to an object format

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and when you say, hey compiler build for me,

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the compiler is only going to build exactly what it needs to build.

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So if it realizes that this source code

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already has an object file associated with it

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and the source code hasn't changed, then why bother building it again, right.

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So it's not going to build it and it does that to be efficient, which makes a lot of sense.

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But occasionally, you want to do a clean that removes all of that stuff.

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It removes the exe that was created.

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And then you want to build again. So now we're going to get a clean build.

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Again, this is really not an issue here when we've got one cpp file.

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But if you've got thousands and thousands and thousands of files,

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there can be a significant difference in the amount of time

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that it takes to do that build.

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Okay. So in this case, I can come over here to the project.

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I could right click, and I can say clean.

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And you'll see here the clean is complete.

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All it did was remove any object files and all in the exe files.

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Then I can say build.

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Now when I say build,

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by saying build project here pressing F7

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or on mac whatever the option, command option is

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or I can right click on the project and say build.

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Now what's going to happen here is it's going to go through

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your project looking at all the c++ files

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and only build what it needs to build.

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Okay. Now in this case it's going to build everything because it's just the one file and I haven't built it yet.

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But it's going to not build what it doesn't need to build and that's important to understand.

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Rebuild is the combination of a clean and a build.

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So when you say hey rebuild the project, it's going to do a clean,

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it's going to clean everything out and then it's going to build it again.

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For the beginning of this course, all of these are going to be just fine.

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You can use rebuilds because it's going to be pretty quick.

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Finally, once we get a build, we can run the project.

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The way we do that is we come up. Again remember, we've got the active project here.

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I can come up to build and run.

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Now if I do that now,

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we have an option we can simply execute the exe file

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if there if there is one there or we can choose to build and execute.

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I would generally tell you to select build and execute

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and probably remember my answer don't ask me again would be a pretty good idea

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because most of the time our files are going to be fairly smalland the

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build is not going to take any time at all. So we can build and execute.

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Okay. So that's how you run.

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Let's say, I want to do that. Now I'm going to say build and execute,

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and there's my program it says,

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enter your favorite number between 1 and 100.

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Let's say I type in 24, press enter.

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It says amazing, that's my favorite number too.

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Now this time elapsed is how long the program took to run.

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This is being displayed in the latest version of CodeLite.

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Prior to this last version, you didn't see that and I think it's windows only it's being displayed.

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I didn't see that display on a mac.

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When you run the exe file that's created from the command line,

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you don't see that. That's just mostly for fyi.

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So that you can tell as a developer

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if there's something wrong and how quick your program is running.

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Press any key to continue, I'm done.

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Okay.

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Now one of the things that I want to show you. Notice this workspace view,

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which is where I'm at right now.

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And again, I've got three projects here. Each one has a main.

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Where's the exe files. Where are the object files.

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Where's all that stuff. They should be there, right.

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Absolutely, they should be there. And they are there.

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The IDEs

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generally hide that information from you because you don't need to know about it really.

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I mean do you care that there's an object file or an exe file, really what you

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care about is these error messages and so forth.

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But we have this explorer tab

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and that'll let you see all that I want to show you what that looks like.

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You can click on the explorer tab

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and then you can drag any folder from your operating system, from your file system onto here.

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So I can just right click, open folder

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and I'm going to select from my desktop cpp examples

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that section 4 folder.

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That's where my workspace is, and I'll select it.

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Okay. So you can see now if I expand this,

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you could see a bunch more stuff. Now I've got a .codelite folder that has

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things that are related to my favorites and compilation

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and refactoring and so forth.

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I've also got my three projects, first program project1, project2.

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I've got a make file. I've got my workspace file

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but let's look at first program for a second.

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Now you can see a little extra stuff going on, right.

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Before all we saw was main cpp. Now we see all this other. Stuff

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these are the files and the configuration files that CodeLite is using

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behind the scenes.

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The IDE workspace here

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abstracts that out since you don't really need to know all that information

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to build your system. It's building it for you.

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But if you really want to see them you can or you can just look right in your file system.

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Now if I look in my first program debug folder,

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you'll see that there's my exe, firstprogram.exe.

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You can see it right here. And there you can see my .object files and .d files and all kinds of stuff that's going on.

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Now you'll see first -- again first program debug.

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Now what I'm going to do now is I'm going to clean first program.

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And all of this stuff should be removed.

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So again, I'm going to go to build,

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clean project.

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Now if I refresh this view by right-clicking up here, refresh,

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and go back to first program, you can see it's all gone.

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The entire debug folder is gone. The object files are gone. The exe files are gone.

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Everything's gone. So now when I rebuild, all that will be created again.

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And now you'll notice that debug folder, right.

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Well, if I come back to my workspace,

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there's my first program. Notice that we've got

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build configurations here. And there's a couple you've got debug and release.

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You can choose either one.

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We're going to use debug throughout the entire course because that's what we're doing.

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We're basically developing right here.

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Release is when you want to release the file from two productions for your users to use.

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So in this case, debug creates that debug folder that you saw a little bit ago.

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If we do this in release mode, we'll get a release folder as well. So we'll have two exes.

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Now the difference is the debug configuration

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creates object files that has debugging information in them.

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It's got all those variable names and stuff.

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So later on when we debug our program,

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we can have all that information available to us

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and it makes us very, very productive.

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And it really helps us debug and test our code.

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The release configuration removes all of that stuff.

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And it does more optimizations.

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And it just makes your exe leaner and meaner. So that you don't need all

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that debugging information at runtime.

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Okay. So like I said we're going to use debug.

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You can certainly use this if you like

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if you do use this because you're curious or you want to see what's going on,

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don't modify anything from in here.

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I mean as a matter of fact if I try to open up this make file,

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you'll see it says auto generated by CodeLite. Don't change it

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or even if you do change it, we're going to blow it away anyway.

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So you really don't need any of that.

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This is where we're going to be working in the workspace mode.

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But I just wanted to show you how that clean really, really works.

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Okay. So again, let's recap here.

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I can select first program. Right click,

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clean.

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That'll remove all my object files in the exe file.

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I can rebuild in which case it will clean and build

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or I can simply build and that will only build what needs to be built.

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Okay hopefully, that makes sense. It's a little difference between them.

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But it said you should understand it's not that big that big a difference.

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Now finally, we want to run. We come here to run.

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So let's do this one more time. I'll build and execute,

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enter your favorite number. My favorite number is 100 this time.

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Amazing, that's my favorite number too. That's exactly what our program is supposed to do.

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Now you'll notice a couple of things here.

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One is we're really not using favorite number,

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are we? I mean the user is typing it in, but we're not really saying

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wow that's a great number 13 that you entered or 100 that you entered.

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And you'll do that in the challenge exercise in this section.

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But right now we're grabbing it, we're storing it into that variable.

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But we're not really using it afterward.

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And then, like I said, in the challenge video, you will use it.

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So that's it. That's pretty much the build process, the compile process,

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the run process. It's fairly straightforward.

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If you've got the toolbar, you can click on buttons to do this.

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But in this course, I'll come up here and do these things or I'll just right click here

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and do what I need to do here as well.

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That's it. Remember, you can also come up to the workspace,

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and right click on the workspace, you can build

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the entire workspace or clean the entire workspace.

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And that will create exe files for all the projects, all in one shot.

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Okay that's it for that.

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Now in the next video what we'll do is we'll talk about

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compiler errors and compiler warnings.

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And we'll mess around with this program a little bit.

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And I'll show you some of the common errors and some of the common warnings that you could get

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as well as why they happen.

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Now throughout the course, we're obviously going to see a lot of compiler errors.

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I make it a point that when I teach I'm just coding

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along with you.

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So I hope I make some mistakes, so you can see some of the common

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compiler errors.

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I'm not trying to make them intentionally, but sometimes

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you know you forget a semicolon or you forget to do this,

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this is the wrong type. So that's important that you see these types of errors

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happening, and you can know how to fix them.

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All right. So I'll see you in the next video.