"Objective-c" 03-First OC Program

I. Open Xcode and create a new Xcode project

two. Select the simplest command line item

Since we are only learning OC syntax and have not formally entered iOS development, select command line items to

three. Enter the project name and select the foundation framework to create the project

* Type A must select the foundation framework, because the common classes of OC are included in this frame

* The bottom "use Automatic ..." is not checked at the moment, which is related to memory management. Talk about memory management.

Four, click Run, running the project

* C language source file extension named ". C", OC Source file extension named ". M"

* MAIN.M file is the only source file in our program

* The compiler compiles the. m file into an. o target file, such as MAIN.M will become a MAIN.O file after successful compilation

* The result of operation is:

2013-04-06 15:35:32.583 First OC program [429:303] Hello, world!

The first OC program is running successfully!

"Objective-c" 03-First OC Program