@interface Person : NSObject {

@public
NSString *name;
@private
int age;

}

@property(copy) NSString *name; @property(readonly) int age;

-(id)initWithAge:(int)age; @end

NSArray *arrayLiteral = @[@“abc”, @1]; NSDictionary *dictLiteral = @{

@"hello": @"world",
@"goodbye": @"cruel world"

};