New in Objective-c, Hello World

Question

I am just starting to learn Objective-C programming. I am developing in Xcode 4.2 on Mac OS X version 10.7.2 on iMac. I am reading Stephen Cochan's book Objective-C Programming, which contains a simple Hello World example:

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSLog (@"Hello, World!");
    [pool drain];
    return 0;
}

When compiling, many errors are reset:

/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.hhaps13:19: error: unknown type name 'NSString' [1]

There are many more. Is there something you need to do before compiling for the first time? Some settings in Xcode?

Answer 1

Unknown typename NSString , c- () c-

Answer 2

, , . , -, c

File → new project Cocoa Application .

'didFinishLaunchingWithOptions' appdelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSLog (@"Hello, World!");
    [pool drain];
    return YES;

}

. Hello World .

Answer 3

. , , " ", "Core Foundation", "Foundation" , . . !

Answer 4

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