Find Project Builder in /Developer/Applications.

Double-click the icon.

Click Next on the Assistant’s welcome page.

Choose your build products location and click Next. The first page of the Assistant asks where you’d prefer to keep the build products (an executable or library, for example) and intermediate build files (object files, for instance). The default is to keep both in the build directory of the current project, but you can choose whatever directory you wish.

Choose your editing preference and click Finish. The second and final Assistant page asks whether you prefer to open new text files in separate windows or to open them in Project Builder’s single-window code editor.

Select Foundation Tool from the list of templates and click Next. The New Project Assistant gives you an opportunity to name your new project and choose a location in the file system in which to save it. See Figure 5.2.

Type Hello World in the Name field.

If you don’t want to use the default project location (your home directory), click the Set button and use the file-system browser to navigate to the directory where you want your project to be saved.

Click Finish.

In the Groups & Files list of Project Builder’s main window, click the disclosure triangle to the left of the Source group.

Click main.m. You will see the contents of the file in the code editor, as shown in Figure 5.4.

Figure 5-4. Project Builder’s Groups & Files list

The main.m implementation file contains the entry point for the application. The Foundation Tool project template provides a standard main function for you that prints “Hello World” to Project Builder’s Run pane. Don’t worry about the function of the NSAutoreleasePool right now; it will be covered in the next chapter.

int main (int argc, const char *argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

    // insert code here
    NSLog(@"Hello, World!");

    [pool release];
    return 0;
}

The NSLog function works very much like printf in the C language. The difference is that NSLog takes an NSString object instead of a C string. Apple’s Objective-C compiler includes the @"" directive, which creates an NSString object using the characters between the quotation marks.

Click the Build button in the main window.