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Sign this lesson we learn how to start a new command line project and how to print some values.

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That is how to out food.

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Somebody so to do that.

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Let's jump back into Mexico.

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We're going to go here to explore that I'm going to say file new project.

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And up until now we have been doing Iowa's single view applications.

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But for now I'm going to move into my course we look for something called command line tool.

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So it's starting a new project in a sort of Iowas single view up.

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I'm going to go to my quest command line tool and I'm going to say Give me a command line tool and this

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is my command line through 0 1 and the next and I place it in the same misthought as usual.

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And now I have a command line tool which is quite different than when you have an all US application

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a command line to essentially is a tool that you can run it in a terminal.

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So it essentially does some things at a terminal level in your Mac operating system.

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We are however not going to do that all of you are going to do is we're going to use this interface

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for learning programming.

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And the first thing that we have to do is we have to learn what happens if we build and run this application.

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So let me build and run it.

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And as you can see them all and it builds and runs.

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It compiles this application.

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It goes through all different lines and does exactly what this one asks it which is printing hello world

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which is this.

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So let's quickly talk about that and to do that I'm actually going to reformat this text a little bit.

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I'm going to say this thing this curly bracket down there on this line here it automatically indents

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itself because it is nested inside another one.

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And at some point we will talk about all of these things but the only line I want to talk about right

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now is this one which is essentially our print command.

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So if I say and Aslaug and I say this log This is Iowa s boot camp as you can imagine the moment I run

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the application it does.

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It prints the same thing it prints one line of saying hello world and other line of printing.

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This is Iowas food.

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Although this may seem quite unnecessary and may seem that you know it's quite trivial and we won't

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be using it for anything for as long as we are in a command line tool.

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This really helps us understanding the result of our application.

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So if we run a piece of code we can see the result of it by printing success or failure or if you're

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searching for something in printed value by knowing you know what kind of results we got for that.

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We found that one or not.

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Another thing that you must mention I must mention is that up here in the command line tools the app

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isn't constantly running.

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So the app isn't in a mode that like in Iowa as it is in the wrong time mode.

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Here it runs and then it exits which is as it says your program ended with exit code.

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It finished you know running is of course trickles right out that it stays continuously waiting for

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for instance input from user.

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But for now we don't need to do that.

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We just need to be able to print some news.

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So to keep your recap file new project and now set up an office any kind of application makeovers.

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And in your command line tool that's more or less what we'll be using for the most part in this section.

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I might jump back into Iowas from time to time but for the most part we'll doing Buddh be doing command

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line tools in the command line to remember to keep your language as Objective C for now.

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So with that in mind this move on to our next lesson.